Difference between school physics teachers and Organic Chemistry Tutor Teachers teach you definitions, formulas, laws Organic Chemistry Tutor not only teaches you the three above but also teaches you where it came from and how things work. Excellent 10/10 channel on YT Improved my physics grades by rocket speed.
Don't write these definitions in your physics exam, you'll commit atrocities I'm telling you, just copy paste the exact same words for definitions and laws
you are just making up crap, not all school teachers are good but I've never had a school physics teacher that didn't teach where the physics came from, the theory behind the formulas and laws....thats what physics is
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I believe you've made a mistake in the problem with light passing through air, glass and diamond (around 20:00). When calculating the final angle you used sin(35.26), whereas I believe it should be sin(57.74), which is the angle between the normal line and the light. You would then get an angle of 30.69 instead of 21.1. Please correct me if I'm wrong.
No, actually, he has a point. The new angle of incidence is equal to the old angle of refraction, because these are two angles with parallel lines and a secant in the form of a reflected ray.
If you’re talking about the angle about the normal line of the refraction light then no you do not. Theta 2 (reflection) = theta 1(incident) and theta 3 can just be solved using the formula n1sin(theta1)=n3sin(theta3)
The numbers are interchangeable so it can be considered angle 1,2, or 3 as long as you know the difference in each and know how to apply them in each formula
I'm wondering the same thing. I don't follow the reasoning of the replies you've received either. His initial process involves relating angles between the ray of light and the "normal line". Then he switches for the second calculation to using the angle between the ray of light and the surface to find the third angle.
@06:53 So close. The wavelength does not change. Different wavelengths refract at different angles. Refraction does not change colors, just the angle they are deflected. You cannot put a red laser into a prism and get a blue laser out (unless it's a KTP or BBO crystal, but that's another can of worms).
wavelength does change, when light enters a denser medium, the wavelength shortens. If this were not the case formulas such as speed = wavelength * frequency would not work as speed definitely changes, frequency definitely doesn't change therefore lambda must change as well.
I was really hoping to find a formula which relates the index of refraction, or the change in the speed of light on the one hand to the wavelength or the frequency of the light on the other hand. Obviously, different frequencies/wavelengths of light diverge in a prism due to this principle, but what is the mathematical formula that allows you to predict the degree of bending or slowing by knowing the frequency or wavelength?
I'm fairly sure you got one of your practice questions wrong, in the question that light travels from air to glass to diamond. Shouldn't the intercept angle from glass to diamond be 90-35.26= 54.72? As that is the angle from the normal line 20:14
Why didn't you use the angle of incidence for the second step of the second example problem? Shouldn't the final equation be 1.5sin(90-35.26)=2.4sin(theta)
very helpful. Thank you for all the effort you put into making this video. If its not a big deal could you make a video tutorial on how to apply trigonometry in solving ray diagram equation.
Totally understand this video! Thanks! Saves an hour of my physics teacher teaching me things that I don't understand but this video half an hour has made me understand everything about refraction! ¯\_(ツ)_/¯ ^_^
How do you calculate the angle for the total reflection that is caused when light is from air to water? For example if you are besides a lake, you can see the light reflected off from the water surface
Great video. Hoping you can clear something up for me. How does wavelength change, but frequency does not? I have been beating myself up on this one. I'm trying to figure out how a change in wavelength does not change frequency.
Final Exams and Video Playlists: www.video-tutor.net/
Difference between school physics teachers and Organic Chemistry Tutor
Teachers teach you definitions, formulas, laws
Organic Chemistry Tutor not only teaches you the three above but also teaches you where it came from and how things work.
Excellent 10/10 channel on YT
Improved my physics grades by rocket speed.
I think you missed one thing for the teachers: they give you a hell lot of practice.
Don't write these definitions in your physics exam, you'll commit atrocities I'm telling you, just copy paste the exact same words for definitions and laws
you are just making up crap, not all school teachers are good but I've never had a school physics teacher that didn't teach where the physics came from, the theory behind the formulas and laws....thats what physics is
Taught me more than my physics teacher... in a year🙏 thanks
Because of this stupid pandemic my science teacher moves way too fast, I'm so happy this video exists
So true
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You are a life saver! I always watch your videos before my physics quizzes and I've done so much better on them ever since! You are amazing thank you so much
I don't know why you do these videos , but the amount of times i come back to your channel for a better explanation then my teachers is ridiculous, thank you again and again and again pls keep doing this awesome kind of videos
I have an final exam next week and I literally have no one to explane this to me , but your videos are super helpful I really thank you so much , I hope you all happines to you in life ❤
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I only have 2 months for my exam ..I'll try to complete syllabus by watching your videos ....your videos are interesting i easily get zoned out when my class teacher explains.... anyways thank you for saving me 🙏🏻
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I believe you've made a mistake in the problem with light passing through air, glass and diamond (around 20:00). When calculating the final angle you used sin(35.26), whereas I believe it should be sin(57.74), which is the angle between the normal line and the light. You would then get an angle of 30.69 instead of 21.1. Please correct me if I'm wrong.
right
he misplaced the 35.26 which is supposed to be an incident angle. so it's still sin(35.25) to be used.
Yes, I also noticed this mistake.
No, actually, he has a point. The new angle of incidence is equal to the old angle of refraction, because these are two angles with parallel lines and a secant in the form of a reflected ray.
Very brief and very interesting technique. I understand everything :)
Here to study for my Lights and Optics exam tomorrow in Physics , Thank you 👍👍
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Me
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Me
20:01
But, It is not supposed to use the (90-35.26 or 54,72 angle), as we used on the first one!!!?
To find Theta 3, dont you have to use the complementary angle of Theta 2, in order to use properly the Snell's law?
If you’re talking about the angle about the normal line of the refraction light then no you do not. Theta 2 (reflection) = theta 1(incident) and theta 3 can just be solved using the formula n1sin(theta1)=n3sin(theta3)
The numbers are interchangeable so it can be considered angle 1,2, or 3 as long as you know the difference in each and know how to apply them in each formula
Actually if you’re talking about 20:15 then yes you are right I think he made a mistake
Never mind I saw what he did , it’s because it’s the opposite angle that is equal
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At minute 20:15 isn't the angle of incidence as the light moves from glass to diamond suppose to be approximately 54.74° and not 35.26°?
look at the angle of the air and the location of the angle
If you used alternate angles, then you should get around 54.74° which is incorrect as it is not specified if it's a parallel line.
I'm wondering the same thing. I don't follow the reasoning of the replies you've received either.
His initial process involves relating angles between the ray of light and the "normal line". Then he switches for the second calculation to using the angle between the ray of light and the surface to find the third angle.
Just use some geometry or trig on the problem and you’ll answer you’re own question
using AIA, it actually is the angle. I thought what you thought at first
please do a video on refraction through a glass prism.. thanks
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you can literally divide 30 by 3 and multiply by 2 (to get 1 from 1.5) to get a correct answer with the error of around 1 degree
@06:53 So close. The wavelength does not change. Different wavelengths refract at different angles. Refraction does not change colors, just the angle they are deflected. You cannot put a red laser into a prism and get a blue laser out (unless it's a KTP or BBO crystal, but that's another can of worms).
wavelength does change, when light enters a denser medium, the wavelength shortens. If this were not the case formulas such as speed = wavelength * frequency would not work as speed definitely changes, frequency definitely doesn't change therefore lambda must change as well.
Go ahead sir, am having my test on that topic coming Friday
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20:00 I thought we are gonna subtract from 90 degrees☹️☹️
I was really hoping to find a formula which relates the index of refraction, or the change in the speed of light on the one hand to the wavelength or the frequency of the light on the other hand. Obviously, different frequencies/wavelengths of light diverge in a prism due to this principle, but what is the mathematical formula that allows you to predict the degree of bending or slowing by knowing the frequency or wavelength?
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I'm fairly sure you got one of your practice questions wrong, in the question that light travels from air to glass to diamond. Shouldn't the intercept angle from glass to diamond be 90-35.26= 54.72? As that is the angle from the normal line 20:14
Nuh uh
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Why didn't you use the angle of incidence for the second step of the second example problem? Shouldn't the final equation be 1.5sin(90-35.26)=2.4sin(theta)
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very helpful. Thank you for all the effort you put into making this video. If its not a big deal could you make a video tutorial on how to apply trigonometry in solving ray diagram equation.
this guy is great
nice video but i have a question. @ 20:35, shouldn't the new angle of angle of incidence that goes into diamond be 55 degrees?
Ifeanyi Martins-udeze for glass i got 34.4 instead of 35.26 but i still got 21.1 after i plugged it in
Great video!
Thank you once again.
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Totally understand this video!
Thanks!
Saves an hour of my physics teacher teaching me things that I don't understand but this video half an hour has made me understand everything about refraction! ¯\_(ツ)_/¯ ^_^
Yea!🙏
How do you calculate the angle for the total reflection that is caused when light is from air to water? For example if you are besides a lake, you can see the light reflected off from the water surface
Great explanation! Thanks for that.
this was super helpful, tysm
thank u tutor you help me a lot
Great video. Hoping you can clear something up for me. How does wavelength change, but frequency does not? I have been beating myself up on this one. I'm trying to figure out how a change in wavelength does not change frequency.
How is a rainbow made? Why are boobs good? It just is.
for one of the last example i dont get why for n3 you used the n of air. isn't it contacting with the material again? so shouldn't n3 be 1.2?
80 degrees is the answer at 27:50
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He made mistake in 20:50, he didn't do 90°-35.26°
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