As a physics tutor, I've found this video to be very useful. Many professors do not perform an in class demonstration of critical angles, leading many students to not understand critical angles and think of it as an abstract topic. Showing them video has contiually been the easiest way to help them understand. Thank you for a simple video
Is there anyway you can describe what's happening & how it is used w/o putting yourself out? If not thanks. I'm fascinated by light, physics & geometry. I lack the education though.
@@wellrose17 in this video, total internal refraction of light is being demonstrated. When light enters from optically rarer medium (air) to optically denser medium (glass slab) it bends towards the normal. When light travels from optically denser medium ( glass slab) to a optically rarer medium (air) it bends away from the normal. This case is required in TIR. When the angle between the incident ray and the normal becomes greater than the critical angle, TIR occurs. What is critical angle? Critical angle is the angle where the refractive angle becomes 90°, which means that when light is refracted going from denser to rarer medium, it's seen as grazing emergence ( refracted ray passes through the normal )
@@wellrose17 If you want a simpler explanation, you notice those angle markings? When the angle at which the light hits the glass is lower than around 42°, it's slightly bent, which is shown in the beginning of the video. When it is at exactly 42° (the critical angle), the light is dispersed, forming a spectrum (the rainbow stuff you see around 0:56). After that, when the angle is higher than 42°,the light is instead reflected, which is the Total Internal Reflection in the title of the video. If you want specifics, the dude above me did it pretty damn well.
0:56 Here he crossed the Critical Angle of glass that is 42°. At this point, the refracted ray is along the glass-air interface. After crossing that angle, no refraction occurs and only reflection takes place :)
Refractive index of glass is about 1.52. However, after applying formula of refractive index (sin i/sin r, included that the critical angle of glass is 42°), the result is about 1.49. So, a better representation for the critical angle of glass would be 41°, because when applied it is about 1.52 (or closer anyway).
A teacher once asked me what can be learned from silence then immediately said nothing can be learned. And just now by the sound of silence ive learned more than that teacher ever taught me.
@@silentHunter123 did you not even fully read my comment? I already said it was dispersion! And yes, I already know that the the refraction, reflection and refraction again, of light through two materials that have a different refractive index and are at different angles relative to the direction of travel of light, will separate light into its constituent visible colors! XD
@@ivanshuyadav566 well, actually I'm not very upset, I just thought it was hilarious that somebody could be so blind when commenting. 😂 (no offence Shashwat Saxena)
The light source is a standard school ray box. If you're after a similar source I would actually recommend using a laser spirit level - they produce much brighter beams and can be bought fairly cheaply from most DIY stores!
This is the first time I got actual feel of Total Internal Reflection I really appreciate this video,,,and would love to see more such phenomena practically
Everybody can actually observe Total internal refraction by opening their eyes underwater and looking up to the surface of the water. (Either in the ocean, but also a larger bath tub will work.) You will typically see: 1: A central, circular area which forms at the water surface and in which you may directly observe the surroundings above the water surface (e.g. the sky). In the video, this corresponds to the light ray exiting the glass. 2: Outside of that central spot however, the underwater enviroment is mirrored. (In dark underwater enviroments this part of the water surface is often darker or even black. In a bathtub or any really bright enviroment however, this might take on more the appereance of a bright mirror image.) So the angle at which that circle sits indicates the angle of total internal refraction. (And of course it is not a perfect circle, but quite distorted by waves.) This explains the typical look of underwater images facing up to the surface.
I honestly did not get a goddamn thing from my lessons on reflection. So uninteresting. And that's from the guy who read the textbooks for fun a bit ago.
PERFECT demonstration !! From refraction to total internal reflection, once critical angle is passed.. + a look at how reflection already happens to a small extent just before achieving i=C. TQ !! 👍🏻👍🏻
Excellent, as a student gemmologist, I find that this is an excellent video for studying refraction and Total Internal Reflection (TIR). Towards the end of the video, you were going towards the critical angle, where the angle of incidence is at such an angle that the angle of reflection is both reflecting and refracting along the optically dense media. Thank you for the superb video, I would definitely recommend it to my fellow student gemmologists.
Never seen such a beautiful way of explaining this concept...it was not only interesting to watch it happening live but quite useful to understand the theoretical concept easily 👍... great work 👍
One of the best video I've seen in RUclips in my life, If we don't use these amazing videos to educate students, this digital world would be a waste This is called the real learning. Thank you for this magnificent video
Such a beautiful demonstration. I wish physics teacher actually showed us experiments rather than being worried about quickly completing syllabus. I think nothing can match the clarity that experiments provide. First the experiment should be demonstrated and then from their we should connect it to the theory That will make physics a better experience for most students
Perfect Video. no Music NO inane commentary something a half decent teacher in a mud hut in the middle of Africa could use to demonstrate he concepts involved. at my school we had the equipment, but videos like this mean that NO Pupil in the world needs to be ‘deprived” more please.
Love this man.... You cleared all my doubts of geometric optics in just 1:43 min... 😍😍😍😍😍 A fan of your and your kind work..... Please keep helping student like me....... Love from india....
Wow amazing - I studied that in physics 30 years ago and loved it but now I love it more after watching this video - I like the rainbow near the end of this video
I LOVE THIS VIDEO. AS A GRADUATE GEMOLOGIST I USE TOTAL INTERNAL REFLECTION WHEN I TAKE REFRACTIVE INDEX READINGS AS PART OF THE PROCESS OF IDENTIFYING A GEMSTONE. BIG FUN!
@@urzsulaz2604 A standard, good quality gemological refractometer is what is used. There are several videos available on RUclips that provide information on how to use it.
Physics tell us how our universe work, real demonstration should be in daily school learning to make student more understanding the basic concept of physics
@@ganges2264 Just like light, fluids are made of waves and particles. Everything around us that we see is made of fluids and non-fluids(solid). Light should fall in fluids because we know for sure it isn't a solid but that isn't enough. Light flows in straight line, any fluid that flows in extreme high speed, will flow in a straight line so light can be a fluid.
@@Vetrivel.Shanmugam ah thanks for telling me. However it's very hard to determine light as a fluid considering it breaks so many of the fundamental laws about fluid. Light can be bent , it can be reflected , it can physically pass through transparent objects and it can be warped when around blackholes. I think there are other ways to classify this bcs light is the only thing in the universe that doesn't have mass , which fluids fundamentally need.
@@ganges2264 Thanks, one more important thing I forgot to put it. Just like fluids, light flows, and it flows parallel inbetween spaces. blackholes doesn't bend light, it bends the space whereas light simply flows through the bent space. Light has mass, its mass element is called photon.
Thanks a lot sir! All of your videos are really helpful! Sir please make a video demonstrating a difference between virtual and real image! Please sir! This would be a great help for me! Hope you'll help!
@@samoriginal yes. Here is how it occurred to me. There are only two forms of matter that we can visually see. Fluids and non-fluids(solids). Though we can say straight forward that we know for sure light is not a solid, it can be a fluid is not enough. So digging into more properties of light we have. Light is both a particle and a wave. A Fluid is both a particle and has wave on disturbance. Light travels in straight line. A fluid can travel in a straight line at high speed. Light travels in high speed and in straight line similar to fluid.
This is an amazing!! I would like to make a demonstration for my children. Could you please let me know what light source you used for this, and how you made the housing for the light source?
The light source housing was bought from an educational seller, but a suitable set up could easily be constructed using a 12v bulb and some cardboard (be careful if the bulb gets hot thought. To be frank, though, the best way to do the experiment is to use a laser pointer instead of a bulb. They can be purchased for very little money and are very bright.
[2023-11-11] We did this experiment in my 8th-grade (Jr. High) "Light" class almost a half-century ago (c. 1974). We had to observe and collect data of the exiting light's refraction angle at various angles of incidence into the glass block and determine at which angle of incidence, the light was internally reflected by the straight face of the block-scientific ideas on the properties of light, being introduced to 13-year-olds. Fascinating that the light apparatus hasn't changed in all those years. The screen in the apparatus can be inserted upside down (with the 3-slit side down) which would allow us to see the interference pattern of light emanating from the apparatus (demonstrating the wave properties of light). You can also see the interference in the lone beam emanating from the apparatus, as light tries to spill, at various intensity, either side of the primary beam.
Well if you had the internet connection during class it could have heard it, you also could have searched for the topic on google or if your google account is connected with social media like facebook or something then the friends you have could have searched for the topic on google. It's all connected... quite scary.
Glad this is finally practical! So happy to see that this isn't some abstract topic we learn in class and that's that. Happy to see it exists for real and isn't just another theory
n * sin (a) = n * sin (b) 1 * 1 = n * sin (42 +-1) 1/sin (42 +-1) = n (asuming that everything is correct, the light beam is monochromatic (even though we can see that it is not), n of the air is 1, a = 90º and b = 42º) n = 1,49447... (n ~ 1,5) whith that +-1º of error n of the glass is between 1,5243 (41º) and 1,4662 (43º)
This is so satisfying to watch😍😍 Amazing, I had no idea about what is TIR, it was so boring learning the topic from the book after watching this video I clearly understood what actually TIR is thank you so much☺☺🤗🤗
Lessons will be more fun and interactive if these experiments are done in class. Students will also develop an interest in the subject. Unfortunately, teachers just keep loading childrens' brain with theory only.
I fully agree! Experiments are not only the most fun part of science, but also the most important part. It’s through experimentation that we learn about the world, discovering and confirming the theory taught in the classroom.
my teacher did that too and it was so dumb we never understood anything she just told us to look at pins from inside the slab and mark where we put the pins and hand it over to her and nobody understood a single fucking thing and then she started insulting us about how we are dumb. a total waste.
Most people will know this phenomenon from *being underwater* (in a pool) -look up to the surface and you can't see past the surface -all the light is reflected internally. UNTIL you get close to the surface, pass the critical angle, and suddenly look up and you can see the sky.
this is what i call real learning. You demonstrated total internal reflection very well.
And I thought dispersion was possible through prism only
At 54 dispersion
Sooo turu👍🏻
Yes
Without speaking a single word!!!!!!!
As a physics tutor, I've found this video to be very useful. Many professors do not perform an in class demonstration of critical angles, leading many students to not understand critical angles and think of it as an abstract topic. Showing them video has contiually been the easiest way to help them understand. Thank you for a simple video
Is there anyway you can describe what's happening & how it is used w/o putting yourself out? If not thanks. I'm fascinated by light, physics & geometry. I lack the education though.
Finally a teacher that wants the students to understand!
@@wellrose17 in this video, total internal refraction of light is being demonstrated. When light enters from optically rarer medium (air) to optically denser medium (glass slab) it bends towards the normal. When light travels from optically denser medium ( glass slab) to a optically rarer medium (air) it bends away from the normal. This case is required in TIR. When the angle between the incident ray and the normal becomes greater than the critical angle, TIR occurs. What is critical angle? Critical angle is the angle where the refractive angle becomes 90°, which means that when light is refracted going from denser to rarer medium, it's seen as grazing emergence ( refracted ray passes through the normal )
@@wellrose17 If you want a simpler explanation, you notice those angle markings? When the angle at which the light hits the glass is lower than around 42°, it's slightly bent, which is shown in the beginning of the video. When it is at exactly 42° (the critical angle), the light is dispersed, forming a spectrum (the rainbow stuff you see around 0:56). After that, when the angle is higher than 42°,the light is instead reflected, which is the Total Internal Reflection in the title of the video. If you want specifics, the dude above me did it pretty damn well.
@@Blade.5786 she is not a dude!!😅😅👌👌 Keep it up guys zz
Everything would be so much better if teachers taught like this
Yeppp
yeah, cause you can actually SEE what's happening
Good teachers do. Everything would be so much better if ALL (physics) teachers taught like this.
It's extremely easy to imagine this, but for other topics it might help to see things practically
@@cpgautam172 fr
0:56 Here he crossed the Critical Angle of glass that is 42°. At this point, the refracted ray is along the glass-air interface. After crossing that angle, no refraction occurs and only reflection takes place :)
So that's why in the books it says 42°
@@tuahdanish1 Yes... What else did you think?
@@arpitadutta4073 huh wdym
@@tuahdanish1 Nothing much😁 Just asking🤠
Refractive index of glass is about 1.52. However, after applying formula of refractive index (sin i/sin r, included that the critical angle of glass is 42°), the result is about 1.49. So, a better representation for the critical angle of glass would be 41°, because when applied it is about 1.52 (or closer anyway).
A teacher once asked me what can be learned from silence then immediately said nothing can be learned. And just now by the sound of silence ive learned more than that teacher ever taught me.
00:50 and there's your rainbow. although, there is no rain, so lets just call it a light dispersion ray.
that is dispersion bro u dont need rain for that
just the radii of curvature of two surfaces must be different
@@silentHunter123 did you not even fully read my comment? I already said it was dispersion! And yes, I already know that the the refraction, reflection and refraction again, of light through two materials that have a different refractive index and are at different angles relative to the direction of travel of light, will separate light into its constituent visible colors! XD
@@Metal_Master_YT looks like someone got triggered 🙃
@@ivanshuyadav566 well, actually I'm not very upset, I just thought it was hilarious that somebody could be so blind when commenting. 😂 (no offence
Shashwat Saxena)
The light source is a standard school ray box. If you're after a similar source I would actually recommend using a laser spirit level - they produce much brighter beams and can be bought fairly cheaply from most DIY stores!
How to get these materials
Is it possible with
Rectangular glass slab
And using domestic led torch
How to make a slit..
Please answer
Thanks
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam than tell me the density of fastest flowing water
@@metawhirl4609 it's probably a bot... They are replying to every comment same msg
Yes
This is the first time I got actual feel of Total Internal Reflection
I really appreciate this video,,,and would love to see more such phenomena practically
@@vipinchand3956 me too bhai😅😂
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam callate aweonao
To bad this isn't total internal reflection. So you learned nothing
@@Vetrivel.Shanmugam naah light isn't a fluid I think u should study what's light and how the fluid is defined
Everybody can actually observe Total internal refraction by opening their eyes underwater and looking up to the surface of the water. (Either in the ocean, but also a larger bath tub will work.) You will typically see:
1: A central, circular area which forms at the water surface and in which you may directly observe the surroundings above the water surface (e.g. the sky). In the video, this corresponds to the light ray exiting the glass.
2: Outside of that central spot however, the underwater enviroment is mirrored. (In dark underwater enviroments this part of the water surface is often darker or even black. In a bathtub or any really bright enviroment however, this might take on more the appereance of a bright mirror image.) So the angle at which that circle sits indicates the angle of total internal refraction. (And of course it is not a perfect circle, but quite distorted by waves.) This explains the typical look of underwater images facing up to the surface.
0:56-0:57 -> Critical angle
0:58 -> Total internal reflection starts
Love this video ❤❤❤ thank you for uploading ☺
this guy has awsome aim and accuracy, he is probably a pro at csgo lol
headshot
PATT se 😂
Yaa
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam light is Not a fluid. It's an electromagnetic wave.
After watching this I realized Science wasn't borning subject, the teacher was.
*ALWAYS*
So what you found interesting? Economics?😂
@@HelloHiHelloHiHello Nope...Reproduction 😂😂😂
if you study to become the teacher, you would understand why you can't do anything to make the lecture more interesting.
Math 😎
Meanwhile in India
"The formula of critical angle for TIR is.."
Light is the lightest and fastest flowing fluid
Good one.
Critical angle = sin^-(refractive index of air/refractive index of glass)
I honestly did not get a goddamn thing from my lessons on reflection. So uninteresting. And that's from the guy who read the textbooks for fun a bit ago.
Sin theta equals refrative index of air/medium
I remember from 60 plus years ago being taught about reflection, refraction etc but haven’t seen this. Jolly good demonstration and very interesting.
PERFECT demonstration !! From refraction to total internal reflection, once critical angle is passed.. + a look at how reflection already happens to a small extent just before achieving i=C. TQ !! 👍🏻👍🏻
My School Teacher :- Keep Pencil* On The Other Side And See It's Reflection!
Edit :- Pencil's Spelling Was Wrong 😅.
😂😂😂
Same😂😂😂😂😂
Light is the lightest and fastest flowing fluid
Well, that's one way to see it, i guess. When total reflection happens, you won't see the pencil.
@@Vetrivel.Shanmugam how can the speed of light be calculated ?
See you when this gets recommended to everyone 😉
Light is the lightest and fastest flowing fluid
See you when like beggers stop posting overused recommendation comments everywhere
@@a_balloon so true🤣🤣
B
I made one Google search about critical angles and RUclips recommended me this. If this isn't proof that I'm being spyed, then I don't know. 😁
Excellent, as a student gemmologist, I find that this is an excellent video for studying refraction and Total Internal Reflection (TIR). Towards the end of the video, you were going towards the critical angle, where the angle of incidence is at such an angle that the angle of reflection is both reflecting and refracting along the optically dense media.
Thank you for the superb video, I would definitely recommend it to my fellow student gemmologists.
When i really REALLY NEEDED THIS YESTERDAY and i am getting this recommend AFTER MY PHYSICS EXAM
Don't worry, the next time you have a chance you can watch it save it in *watch later* as a folder
Never seen such a beautiful way of explaining this concept...it was not only interesting to watch it happening live but quite useful to understand the theoretical concept easily 👍... great work 👍
Really Really great demonstration.
It was clear, self-speaking and tidy. Great job!
Light is the lightest and fastest flowing fluid
The answer to the universe and everything is 42.
The critical angle was 42 ,so this is proof :)
Jokes aside, cool video.
can you explained to me what is a critical angle ?
@@florence6654 the angle above which no light energy is referacted but it gets reflected from the surface
@@florence6654 0:58 here the critical angle is approximately 42°
Fuck it's incident ray angle(42) for which ray make critical angle(90)on the edge
@@florence6654 the incident angle in which the refracted angle equals to 90 degree
9 years old but still rocking the algorithm don’t know why it came up in my recommended but it did and i’m happy about it.
Now I believe everything total internal reflection says about light rays. This man is the ultimate teacher
Glass when i>c: Maybe I am a mirror.
One of the best video I've seen in RUclips in my life, If we don't use these amazing videos to educate students, this digital world would be a waste
This is called the real learning.
Thank you for this magnificent video
Such a beautiful demonstration.
I wish physics teacher actually showed us experiments rather than being worried about quickly completing syllabus.
I think nothing can match the clarity that experiments provide.
First the experiment should be demonstrated and then from their we should connect it to the theory
That will make physics a better experience for most students
This is what Real Learning really is when you see something Practically, you learn it more precisely than anyone else
Perfect Video.
no Music
NO inane commentary
something a half decent teacher in a mud hut in the middle of Africa could use to demonstrate he concepts involved.
at my school we had the equipment, but videos like this mean that NO Pupil in the world needs to be ‘deprived”
more please.
I really appreciate the clean and well explanatory setup for this ... It might look simple but an art in itself... 🔥 Jai shree ram 🙏
so beautifully demonstrated
'beautifully' is a little strong I feel!
Plzzz Subscribe our youtube channel u will get alot there ruclips.net/user/OnlineClassesETEATricks
Light is the lightest and fastest flowing fluid
Schools should also start practicals like this it will be better for students to learn the concept clearly
You taught me more than 10 years in school man , appreciate it
You explained SO MUCH with absolutely zero words. Inn redible.
9 years later RUclips algorithm decides to recommend this
I was surprised when i saw a portion of light getting totaly internally reflected very early than i thought.
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam I mean it’s also a solid if you think real hard about it
@@Vetrivel.Shanmugam and your brain is the slowest and smallest falling solid
and that portion of light will introduce you to another topic called polarisation of light.
@@akay4086 That's Amazing...❤️
0:55 or 0:56...you can see the seven colours... amazing way of learning... thank you 😄😄
Thank you!!!!!!!
I can't tell you how much of pain I endured before this!
Thank you soo much!
I'm a graduate in physics but I did see this for the first in my life. I love TIR.
Love this man....
You cleared all my doubts of geometric optics in just 1:43 min...
😍😍😍😍😍
A fan of your and your kind work.....
Please keep helping student like me.......
Love from india....
The man is underrated
Light is the lightest and fastest flowing fluid
Simple and very clear. Great job!
this is amazing! I used to know abstractly what it is until you show this experiment.
Wow this video is 10 years old but You Have given practical knowledge on TOTAL INTERNAL REFLECTION. Mujhe to bahut achhe se smjh aaya dekhkr
"If you're feeling science is boring, then you're learning from wrong teacher"
Are u real Elon Musk ?
@@cgv3767 yup, what's the matter
Wow you must have learned so much watching a beam of light with no explanation.
@@theaccordian9377 I'm not saying anywhere that this teacher is wrong or right.
This is beautiful, I've looked at it for 5 hours now.
P.s. Got this in my recommendations after 9 years. xD
Wow amazing - I studied that in physics 30 years ago and loved it but now I love it more after watching this video - I like the rainbow near the end of this video
Even No words required to explain and class's every student understands the concept...
I teach physics to ESL students and this is extremely helpful in explaining critical angle and total internal reflection
have physics experiment exam tomorrow, hoping to pass it. thanks for the video👍
good luck amali spm bro
damn! if teachers taught all of physics like this, i would have become a physics professor 🔥🔥🔥
Fantastic sir. I love the way you teaches physics sir
I LOVE THIS VIDEO. AS A GRADUATE GEMOLOGIST I USE TOTAL INTERNAL REFLECTION WHEN I TAKE REFRACTIVE INDEX READINGS AS PART OF THE PROCESS OF IDENTIFYING A GEMSTONE. BIG FUN!
I would like how do You make that Can You tell me about?
@@urzsulaz2604 A standard, good quality gemological refractometer is what is used. There are several videos available on RUclips that provide information on how to use it.
It’s also really cool to see that light really do bend around corners
I'm so happy this is what called real learning...😀
Everybody got this in their recommended in February 2021 after 9 years
weird; that's what i thought...like the algorithm was saving it up for precisely now.
this video is so good that my physics teacher gave the students a link to this video
Light is the lightest and fastest flowing fluid
Practical is 100 times better than theory 👌
You proved it today 👍
Got this video after 10 years. And still enjoyed this.
TIR is one of the most interesting topic in Ray optics chapter class 12 Cbse
Great work...used with my year 10 lesson to show TIR. Very clear work, thanks :)
Light is the lightest and fastest flowing fluid
And now this video is in everyones reccomended after 9 years....
Physics tell us how our universe work, real demonstration should be in daily school learning to make student more understanding the basic concept of physics
Light is the lightest and fastest flowing fluid
Wonderful demo. There's so much information contained in it.
This is one of the coolest videos on RUclips that I've seen.
Thanks for the video, revising for my test tomorrow and you sure did help! :)
Have u completed ur school
Light is the lightest and fastest flowing fluid
1:43 difracción, so beatiful
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam fluid ? Isn't light made up of waves and particles ?
@@ganges2264 Just like light, fluids are made of waves and particles. Everything around us that we see is made of fluids and non-fluids(solid). Light should fall in fluids because we know for sure it isn't a solid but that isn't enough.
Light flows in straight line, any fluid that flows in extreme high speed, will flow in a straight line so light can be a fluid.
@@Vetrivel.Shanmugam ah thanks for telling me. However it's very hard to determine light as a fluid considering it breaks so many of the fundamental laws about fluid. Light can be bent , it can be reflected , it can physically pass through transparent objects and it can be warped when around blackholes. I think there are other ways to classify this bcs light is the only thing in the universe that doesn't have mass , which fluids fundamentally need.
@@ganges2264 Thanks, one more important thing I forgot to put it. Just like fluids, light flows, and it flows parallel inbetween spaces. blackholes doesn't bend light, it bends the space whereas light simply flows through the bent space.
Light has mass, its mass element is called photon.
People like you make quantum physics wonderable ❤️🔥! Appreciated man!!👍
Sometimes I just love the randomness of youtube's algorithm that shows me this kind of content
I’m Korean and my physics teacher in high school showed this vid to us. It was very helpful to understand total internal reflection 😆
who got this on their recommended 9 years later?
Thanks a lot sir! All of your videos are really helpful! Sir please make a video demonstrating a difference between virtual and real image! Please sir! This would be a great help for me! Hope you'll help!
The real way of learning 👌👀
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam light is a fluid??
@@samoriginal yes. Here is how it occurred to me.
There are only two forms of matter that we can visually see. Fluids and non-fluids(solids). Though we can say straight forward that we know for sure light is not a solid, it can be a fluid is not enough. So digging into more properties of light we have.
Light is both a particle and a wave.
A Fluid is both a particle and has wave on disturbance.
Light travels in straight line. A fluid can travel in a straight line at high speed. Light travels in high speed and in straight line similar to fluid.
@@Vetrivel.Shanmugam Light is an energy, not a state of matter... But it has similar properties with a fluid
@@samoriginal Light is an energy after it hits a surface but while it is travelling it is a matter.
This was so well demonstrated. Magnificent!
IDK how to explain this but this video is extremly aestheticly pleasing and i love it alot for somereason
First good thing in recommendation.
🤗🤗
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam how is it a fluid
This is an amazing!! I would like to make a demonstration for my children. Could you please let me know what light source you used for this, and how you made the housing for the light source?
The light source housing was bought from an educational seller, but a suitable set up could easily be constructed using a 12v bulb and some cardboard (be careful if the bulb gets hot thought.
To be frank, though, the best way to do the experiment is to use a laser pointer instead of a bulb. They can be purchased for very little money and are very bright.
I came here to learn and now I'm aesthetically pleased as well. Love it. :D
Light is the lightest and fastest flowing fluid
Where the hell were you in 1974 when I was struggling to wrap my head around this?
[2023-11-11] We did this experiment in my 8th-grade (Jr. High) "Light" class almost a half-century ago (c. 1974). We had to observe and collect data of the exiting light's refraction angle at various angles of incidence into the glass block and determine at which angle of incidence, the light was internally reflected by the straight face of the block-scientific ideas on the properties of light, being introduced to 13-year-olds.
Fascinating that the light apparatus hasn't changed in all those years.
The screen in the apparatus can be inserted upside down (with the 3-slit side down) which would allow us to see the interference pattern of light emanating from the apparatus (demonstrating the wave properties of light). You can also see the interference in the lone beam emanating from the apparatus, as light tries to spill, at various intensity, either side of the primary beam.
And the degree of total internal reflection for glass is=42°
49°for Water
and 24°for Diamond
Light source: Moves to 45°
Refracted ray: My time has come
shouldn't it be reflected ray?
@@miladsammouh4741 Nope, the refracted ray says that since it's about to vanish
WAIT I JUST GOT THOUGHT THIS AT HIGHSCHOOL YESTERDAY HOW DID YOU KNOW RUclips
They are always watching
Well if you had the internet connection during class it could have heard it, you also could have searched for the topic on google or if your google account is connected with social media like facebook or something then the friends you have could have searched for the topic on google. It's all connected... quite scary.
SAME
Same reaction, man.
Either they listened through my laptop, or some data on Google classroom gave the idea.
Glad this is finally practical! So happy to see that this isn't some abstract topic we learn in class and that's that. Happy to see it exists for real and isn't just another theory
Without saying a single word, he explained it all.
n * sin (a) = n * sin (b)
1 * 1 = n * sin (42 +-1)
1/sin (42 +-1) = n
(asuming that everything is correct, the light beam is monochromatic (even though we can see that it is not), n of the air is 1, a = 90º and b = 42º)
n = 1,49447... (n ~ 1,5)
whith that +-1º of error
n of the glass is between 1,5243 (41º) and 1,4662 (43º)
Nice analysis.
I seem to remember that the material is actually Perspex, but it’s refractive index is in the same region as glass.
@@QuantumBoffin brother this video of yours is sensational, will you allow me to post it on my youtube channel? Of course the credits will be yours.
*This is why I choose the Humanities stream because teachers don't teach in this way.*
This is so satisfying to watch😍😍
Amazing, I had no idea about what is TIR, it was so boring learning the topic from the book after watching this video I clearly understood what actually TIR is thank you so much☺☺🤗🤗
Light is the lightest and fastest flowing fluid
@@Vetrivel.Shanmugam why you spamming?
GREAT demonstration this is how you capture young minds with results bravo
Thank you very much. Total Internal Reflection is not an easy concept to understand and this video makes the concept so easy.
Better video = this video at 2x
He's not wrong.
*Questions in my head*
"When light leaves a denser medium"
But why
And after you know why was that the answer. It'll leave you more questions
Lessons will be more fun and interactive if these experiments are done in class. Students will also develop an interest in the subject. Unfortunately, teachers just keep loading childrens' brain with theory only.
I fully agree! Experiments are not only the most fun part of science, but also the most important part. It’s through experimentation that we learn about the world, discovering and confirming the theory taught in the classroom.
The problem is that they know about this but they arent trying to find a solution
very interesting... your explained it without even saying a word.. this is awesome
Extremely nice demonstration of total internal reflaction
It's helpful..!!
#thxxx🤗🤗
Abhi kaha ho
Light is the lightest and fastest flowing fluid
Reminds me school day's when we have to see pin overlap it's reflection
Say what ?
my teacher did that too and it was so dumb we never understood anything she just told us to look at pins from inside the slab and mark where we put the pins and hand it over to her and nobody understood a single fucking thing and then she started insulting us about how we are dumb. a total waste.
Why did i read total infernal reaction and expected everything to blow up
Ur not the only one XD
Watched total internal reflection as well as dispersion of light!! Woah!! You demonstrated it excellently💫🌈
Most people will know this phenomenon from *being underwater* (in a pool) -look up to the surface and you can't see past the surface -all the light is reflected internally. UNTIL you get close to the surface, pass the critical angle, and suddenly look up and you can see the sky.
Actually it's amazing how few people notice this, until you point it out to them. (I teach scuba as well as Physics)
This is why RUclips was made