lol! I took an optics class and wasn't getting why a light wave entering a glass medium would suddenly change direction either, when I suddenly had the idea of a car riding on a smooth surface suddenly hitting a rough surface with half its wheels, causing the wheels on one side to slow down suddenly; naturally, the car would veer towards the slower side until the entire car entered the rough patch. I laughed when I saw this narrator using the same metaphor I used to try to understand why a wave hitting a different medium at an angle would cause it to change direction slightly.
the car analogy is SO helpful. I've just been trying to memorize what way the light would bend but having an intuitive understanding is so much more helpful. thank you!!!!
The car example was awesome. Sal Khan is a stinking genius. Word from a stranger, I've worked with his family here in New Orleans. Happy to report that.
Just here to see the teaching methodology used and I am awestruck, such detailing in a relatively simple concept shows the passion of this group/guy. I am currently pursuing a masters degree and I have actually not come across many people whou would have taught this topic in such detail Awsome work Sal Keeo it up 👏
Honestly, the main thing I took away from this, as well as the actual knowledge in the video, is that the syllabus for exams has practically not changed at all in 11 years.
If the car enters into the mud, then its left part will get a force in the opposite direction, therefore creating a torque. SO the right part which is in the vacuum should also get a force resulting in it moving faster than light.
thank you so much! i totally understnad this now! got a little confused around 10 minutes but thats probably because i am only doing GCSEs at the moment. i thought the car example was so good! thank you!!!!
at 11:06, the simplest thing to do, is notice each factor has a "C" in it so factor it out and cancel it. And also to notice that (1/x) / (b) = 1/ (x*b), so clearly 1/(n2*sinx2) = 1/(n1*sinx1), which taking the inverse of both sides leaves the result at 12:32. That is how I see the easiest way and fewest steps. but good video nonetheless.
WOW , I watched this a few years ago for my first year physics , and now I'm watching this again for my 3rd year hydrogeology class .... shoulda learned the first time
Great video! Btw guys you dont need to imagine the wave having wheels, the the wave has wave fronts which if you draw them you will understand why it works!
These videos are very good. Im doing Physics HL at Ib which is the second hardest subject you could choose, and sometimes you just need to refresh your memory before a test or an exam, and these videos are simply perfect for such a purpose.
We would like to demo Snell's Law with a laser, a glass. Please advice. We already have a simple video about the law of reflection and refraction of light .
Woah great explanation....... I was able understand it very easily . I think Science becomes more easy and enjoyable when we understand and learn it. Car example was the best :)... Thanks
I love all these videos. But if there's a person watching this video who really needed the explanation as to how he got from n=c/v to v=c/n then they are probably in the wrong place.
Would it still be correct to say that refraction in a more dense medium causes the image to appear to be pulled down? When I hold a horizontal pencil behind a plastic cup of water, the image of the pencil in the water is below the actual image.
Rio Salado Community College is using these as teaching material. I should hope some of my tuition is being donated to you, since you're doing the teaching for them.
This is exactly why you DO NOT want something with a math and economics background (even from MIT) trying to explain basic physics. He really should consult with a mechanical engineer before discussing analogies involving cars. He clearly does not understand terms like: 1) rolling without slipping 2) traction control 3) tire contact patch etc.
The car analogy is the best thing that has ever happen to me Thx sal
Read your comment right as he started talking about it lol.
The car analogy is actually a brilliant setup to learn about Huygen's principle, which says the same thing, just using a bit of more math and geometry
The car analogy is a gift from heaven
That Car Analogy of 10 seconds... Is equal to three lectures of physics delivered by my teacher.
It's not technically correct but hey physics is merely a model at the end of the day.
lol! I took an optics class and wasn't getting why a light wave entering a glass medium would suddenly change direction either, when I suddenly had the idea of a car riding on a smooth surface suddenly hitting a rough surface with half its wheels, causing the wheels on one side to slow down suddenly; naturally, the car would veer towards the slower side until the entire car entered the rough patch. I laughed when I saw this narrator using the same metaphor I used to try to understand why a wave hitting a different medium at an angle would cause it to change direction slightly.
Same
OMG, I am thinking the same
the car analogy is SO helpful. I've just been trying to memorize what way the light would bend but having an intuitive understanding is so much more helpful. thank you!!!!
Khan academy is going to be the reason I pass my exam tmrw
Did you pass?
@@aleksasmuliuolis166 He was caught snorting cocaine later that day
Did you pass? We need to know
@Aleksas Muliuolis @Rebel Pilot lol yea i did this video saved me
@@shumailakhan779 Alhamdulil'lah! Khan is our hero :)
My GOD that car analogy helped me so much
THE CAR ANALOGY IS VERYYY HELPFUL THANK YOU VERY MUCH
The car example was awesome.
Sal Khan is a stinking genius.
Word from a stranger, I've worked with his family here in New Orleans. Happy to report that.
The car analogy is awesome
I never got this explanation from any teacher
He's amazing!!!....
You were my last ditch effort to learn this. And you did a phenomenal job! Thanks for the B+ on my Test
Good job dude
Heck yeah dude, hope you're thriving now
U must be 30 at this point
Bro must be like 28 rn
Bro, you alive?
OMG! ITS LIKE THIS GUY KNOWS EVERYTHING ON THIS PLANET LOL
Dania Hasan He studies it, that's all
Dania Hasan Like a teacher would do
This sounds like the reaction of someone being taught something for the first time after being locked in an underground bunker for 20 years
Lmao
@@nalod2087 lmfao
Just here to see the teaching methodology used and I am awestruck, such detailing in a relatively simple concept shows the passion of this group/guy. I am currently pursuing a masters degree and I have actually not come across many people whou would have taught this topic in such detail
Awsome work Sal
Keeo it up 👏
Watching this at 2x and still understands better as compared to 3 lectures! Thankss!!!!
best analogy ive heard about it
The best part about this is that his cursor is my crosshair in CSGO
+Wacky rank?
it means that it is his mouse pointer while playing counter stroik global offense
Csgo? wtf is that
Joshed George a video game
Joshed George counter strike go online XD
This made refraction so much easier to understand and explain to my son. Thank you very much!
This video was made before I even hit primary school. Now I'm learning from it 11 years after. Man this guy is heck of a teacher.
Who's here in 2021? I am feeling lonely here😢
Yo
here
I gotchu bruh
Tstay hullo
great video to watch while doing blow at 3 am. I've been told
You're a true gift to humanity, Sal!
omg so genius, this car analogy make me so impressive and understand all the fxxxing thing in my textbook, thx teacher
Who's here in 2019? I'm feeling lonely here.
Im here
Thank you so much guys I feel very much better now.
chaw
Hi
Me
Snell's law: sini/sinR=V1/V2=n2/n1. where sini is the angle of incidence, sin R angle of refraction, v for velocity and n refractive index.
Now that car analogy was really something
A verry good job #Mr.khan. You know the most interesting thing is the using of colourfull pens. Students find it more attractive :P.
Sinjini Banerjee no wonder u need to come here you spelled Very wrong
Sinjini Banerjee it's you not u
also very wrong?
Very spelling is this not verry
Honestly, the main thing I took away from this, as well as the actual knowledge in the video, is that the syllabus for exams has practically not changed at all in 11 years.
That car analogy really helped, thanks :)
The example of the car was amazing.. never thought that would be similarised with the traveling of light..lol
Very nice presentation, thank you for the free class. God bless.
the car's example is a the best thing !!
you're the best teacher ever !!
A vacuum is not the thing you use to clean your carpet - Sal Khan 2010
“That vacuum water interface example; I’m not enjoying it.” -sal
This is a legit video man thanks for the trouble.
If the car enters into the mud, then its left part will get a force in the opposite direction, therefore creating a torque. SO the right part which is in the vacuum should also get a force resulting in it moving faster than light.
i hear this guy in the many economics videos i have seen. but now physics as well.. what a man
thank you so much! i totally understnad this now! got a little confused around 10 minutes but thats probably because i am only doing GCSEs at the moment. i thought the car example was so good! thank you!!!!
Can we use Snell’s law equation like the sine rule equation, like flipping the fraction to find the angle or side?
HAHAHAHHAHAHAHAHA cramming time! Finals na bukas
hi this video are use full to me to understand the the conpect
watch the grammar vids XD
if u speak a different language i get it too
cus i speak hebrew mor than english
@@avocadokirby1517 Imagine if Khan Academy had a English tutorial 🤣
Thanks for your videos!
Well, I have understood what Snell Law is. Thanks Khan Academy. My exams are coming 2 days later, let's hope I get good grades.
The car analogy should be the gold standard for teaching this concept
that car analogy was awesome, thanks!
Thank you for this video. The car analogy was so helpful
Analogy on point.
Thanks for the car analogy. I hope to be able to better understand snell's law soon
im the same, our teacher is so monotone and doesnt explain very well, this video has helped so much.
at 11:06, the simplest thing to do, is notice each factor has a "C" in it so factor it out and cancel it. And also to notice that (1/x) / (b) = 1/ (x*b), so clearly 1/(n2*sinx2) = 1/(n1*sinx1), which taking the inverse of both sides leaves the result at 12:32.
That is how I see the easiest way and fewest steps. but good video nonetheless.
Wow this really helped me with my class assignment 💯❗ he's really good
Muchísimas gracias profesor Federico Aragón, entendí todo lindo GRACIAS ENSERIO SOY FAN
This might just have saved my life.
WOW , I watched this a few years ago for my first year physics , and now I'm watching this again for my 3rd year hydrogeology class .... shoulda learned the first time
U alive bro
Great video! Btw guys you dont need to imagine the wave having wheels, the the wave has wave fronts which if you draw them you will understand why it works!
You are the 🐐.
Hats off man extremely helpful.
Thankxx khan academy for this video refraction and snells law
thank you for the simple explanation! Great analogy!
What about refractive index of multiple media like for example
Air
Water
Glass
Find refractive index of glass with respect to water
That analogy with the car blew my mind.
The legend sal always comin in clutch
I came to search for this video because you teach better than my teacher. :P Wish you taught my class physics. Everybody would ace the exams!
thank you! sir 😊
The car example really helped a lot!
Thanks :)
Sul since the light is entering from denser to rarer medium isn't it supposed to turn away from the normal? 5:54
Ye it did that
This is what I am learning in my grade 10 academic science class.
These videos are very good. Im doing Physics HL at Ib which is the second hardest subject you could choose, and sometimes you just need to refresh your memory before a test or an exam, and these videos are simply perfect for such a purpose.
9 years later, I'm an year away from grade 11 in IB so I have to choose my HL's next year
2017 and this helped me so much. Thanks!
Thnx it was really helpful for me
Thank you , you are the reason why I passed my physics exam
Optics is cool topic in physics, because it is visual and can be observed all around you walking down the street.
We would like to demo Snell's Law with a laser, a glass. Please advice. We already have a simple video about the law of reflection and refraction of light .
Woah great explanation....... I was able understand it very easily .
I think Science becomes more easy and enjoyable when we understand and learn it.
Car example was the best :)...
Thanks
man are you still alive
you were watching this video nine years ago while i was in my first grade
im in 10th now and i wanna know what you're upto nowadays after 9 years
Haha, I'm 25 now, I work as a software developer now
less than 3 weeks and this has saved me
Thanks my concept are clear now
A appreciate what Khan Academy has contributed to the community
Thx Now my concept is Clear
Thank you so much. Your videos explain everything in perfect detail! The car analogy is so amazing! Thanks!!!!
I love all these videos. But if there's a person watching this video who really needed the explanation as to how he got from n=c/v to v=c/n then they are probably in the wrong place.
Man it's been 2 years since I first saw this video and I still use that car analogy for optic problems
Would it still be correct to say that refraction in a more dense medium causes the image to appear to be pulled down?
When I hold a horizontal pencil behind a plastic cup of water, the image of the pencil in the water is below the actual image.
What a great explanation, thanks! I'll be using the car idea a lot :D
Very Helpful.thank you
Fantastic !! Great explanation though. Thanks
Thank you so much 💙
OMG! This video was 9 years ago. I feel so young right now🙄🙄
Rio Salado Community College is using these as teaching material. I should hope some of my tuition is being donated to you, since you're doing the teaching for them.
Awesome car example.. Thank you
The car analogy is so smart
This is exactly why you DO NOT want something with a math and economics background (even from MIT) trying to explain basic physics. He really should consult with a mechanical engineer before discussing analogies involving cars. He clearly does not understand terms like:
1) rolling without slipping
2) traction control
3) tire contact patch etc.
It's just an analogy bro it doesn't matter
@@naveensundar4765 In your opinion is does not matter
Thank you so much. I can't explain how much it helped me.
I dont mind ads keep khan academy going
On the line normal to the interface (you draw in this line... in this video it's that dotted line that's perpendicular to the surface).
Amazing example.. thank you
5:51 Wrong Direction! Its going to turn towards the left I think as- you said that the tyres should be moving AWAY from the other medium.
I love this guy.
Thanks. Now I understood it !
Perfect! Very thanks!
Who's here in 2024 ? 😭
Me
🤚🏻
3,290 videos = lots of wisdom!
great explanation!
Thank you sir, Bless your days.
Excellent!!!
Man you the best!