Snell's law example 2 | Geometric optics | Physics | Khan Academy

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Khan Academy

Khan Academy

Күн бұрын

Пікірлер: 54
@iMusikkForeva
@iMusikkForeva 8 жыл бұрын
Sal is a gift from God to us stressed students!
@4ml55shuvroanindyabapari6
@4ml55shuvroanindyabapari6 10 ай бұрын
Absolutely true
@RyanBucao
@RyanBucao 8 жыл бұрын
double lesson! helped me out with my math and my science exam
@viin118
@viin118 13 жыл бұрын
best physics teacher everrrrrrrrrr!!!!!
@nouranmahmoud586
@nouranmahmoud586 5 жыл бұрын
Oh god....you are amazing .... I do understand this lesson that was really diffcult before.....thank you
@MrLachlan127
@MrLachlan127 13 жыл бұрын
THANK YOU!!! My teacher has been trying to teach me this but he doesnt make it seem easy like you did. I think you will be my new physics teacher :)
@chaosforever
@chaosforever Ай бұрын
great problem thanks
@afzalmohamad1715
@afzalmohamad1715 7 жыл бұрын
really help a lot to understand it for more complex things... Thank you
@jemappellelanoosh1743
@jemappellelanoosh1743 12 жыл бұрын
Khan for noble prize :))) u r amazing thx for ur help. This wasso useful
@ytimg62
@ytimg62 13 жыл бұрын
Thank you for doing what my lecturer and that third year uni student that runs the tutorials can't. Teach me physics.
@samkelebaloyi9673
@samkelebaloyi9673 Жыл бұрын
LOL
@AhsanHaider3
@AhsanHaider3 13 жыл бұрын
damn thats a very tall woman!
@MelvinPaulbrains
@MelvinPaulbrains 6 жыл бұрын
Sal why not give some super interesting and quite difficult problems?
@KiberMath
@KiberMath 14 жыл бұрын
That was so cool!! I love your lessons!
@LAnonHubbard
@LAnonHubbard 14 жыл бұрын
I paused and did this problem. I found the angle which as you showed was unnecessary. I had also forgotten about a² + b² = c², so thanks for that too. I also fluffed up at the end using cosine rather than tangent but that was just stupidity LOL. Nice little problem and great explanation.
@rajisamusideen3256
@rajisamusideen3256 5 жыл бұрын
U are a great teacher
@inneruniverse17
@inneruniverse17 14 жыл бұрын
Thank youuuuuu Mr. Khan!
@boeing747200lr
@boeing747200lr 14 жыл бұрын
@armanfazli I can understand the excitement. Its like coming first in the class!! :)
@shivshankargupta2075
@shivshankargupta2075 4 жыл бұрын
Sir you can take more such problem which could help me in competitive exam
@Gringorican
@Gringorican 5 жыл бұрын
you can figure out the incidence angle (theta 1) without finding the x distance by taking the inverse cos of 1.7/8.1
@manq211
@manq211 11 жыл бұрын
after learning basic vector trigonometry this is a scale 2 hard. learn vectors and basic trig for physics and you're good to go and of course u have to know n1sinØ1=n2sinØ2
@Tome4kkkk
@Tome4kkkk 14 жыл бұрын
"this distance is" sounds funny :)
@l052_jeeveshpathak8
@l052_jeeveshpathak8 4 жыл бұрын
why it sounds so funny
@Jonnyc0213
@Jonnyc0213 11 жыл бұрын
bit strange that the adjacent side is shorter than the opposite side on that diagram which clearly shows its more than half the length
@frescamenzi8061
@frescamenzi8061 7 жыл бұрын
so interesting video
@jamestornea4520
@jamestornea4520 3 жыл бұрын
so let me do that in a different color.... no, i wanna do it in a different color. this part made me laugh HAHAHA. Anyway I really appreciate this lesson.
@jdavis417
@jdavis417 5 жыл бұрын
What's that woman so angry about? She's got her very own laser-pointer, after all!!!! ;)
@anhkhoinguyen272
@anhkhoinguyen272 10 ай бұрын
I forgot it’s a right angle triangle, so I used the cosine law to solve for the angle of incident and I used the sine law to solve for y 💀 Took me 10 years longer than if I were to just use SOH CAH TOA. But hey, I got the right answer in the end so it doesn’t matter.
@Sam-ir6iu
@Sam-ir6iu 8 жыл бұрын
theta 1 is 76 degrees btw
@angelsintahoe
@angelsintahoe 6 жыл бұрын
I got 77.88 degrees...final answer still worked out (about) the same...11.1756 or 11.18.
@khabbablamberghini4269
@khabbablamberghini4269 8 жыл бұрын
U ARE AWESOME
@tallis21
@tallis21 6 жыл бұрын
u just saved me
@LiamHorne0
@LiamHorne0 14 жыл бұрын
Third comment, I'm amazing! lol. Good video Sal!
@sumitpal763
@sumitpal763 6 жыл бұрын
Good video Sal
@alessandro.festuccia
@alessandro.festuccia 8 жыл бұрын
Nice lesson. So the woman is about 2 meters tall? ;P
@carllinder-lood4686
@carllinder-lood4686 5 жыл бұрын
This is amazing.
@SillyGeneva
@SillyGeneva 9 жыл бұрын
If it was a laser pointer...wouldn't it just bend again and go straight into the water without having an angle of refraction at all? Because a laser is just light??
@younguzithug
@younguzithug 14 жыл бұрын
First Comment. Finally!
@prem2469
@prem2469 7 жыл бұрын
nice'
@prem2469
@prem2469 7 жыл бұрын
really nice yar
@prem2469
@prem2469 7 жыл бұрын
yes
@boofaloof101
@boofaloof101 10 жыл бұрын
Maybe its just me.. but i have a feeling that the math is incorrect when he divides both sides by n(water).. he has it as dividing directly by n(air). But i believe by algebra rules he has to to divide it by the whole quantity on the left side of the equation so in other-words it should be (n(air)(O/H))/n(water) instead of n(air)/n(water) x O/H.. I could easily be wrong but i just want to check! thanks!
@keivwangz
@keivwangz 10 жыл бұрын
It's the same thing! Multiplication and division has the same priority, so it doesn't really matter which one you do first if there isn't any brackets present. If you would multiply the O/H with the n(air) before dividing n(air)/n(water) you would get (n(air)(O/H))/n(water)!
@ActuallyAudacity
@ActuallyAudacity 9 жыл бұрын
keivwangz For your kind information it does matter. This is because of the BIDMAS rule in which you divide first and then multiply so it does not have same priority. Division is prioritized more than multiplication.
@icemilo1593
@icemilo1593 9 жыл бұрын
Arka Roy Yea but division is the same thing as multiplication i.e. fractions. So if you convert all the things that are divided to a fraction then you can multiply.. e.g. (1 divide 2 x 3) is the same as ( 1/2 * 3 ) so you multiply 3*1 first then divide 2 or you could do it the other way 1/2 = 0.5 * 3 = 1.5
@ActuallyAudacity
@ActuallyAudacity 9 жыл бұрын
Ice Milo Yeah...
@owned2death
@owned2death 12 жыл бұрын
On a scale of 1-10 where 10 being the hardest, how hard is this question?
@IncredibleEtableBaby
@IncredibleEtableBaby 7 жыл бұрын
This is a 3
@benjaminsafari7449
@benjaminsafari7449 4 жыл бұрын
I kinda feel like y should be smaller that the adjacent
@HDic3
@HDic3 11 жыл бұрын
*president.
@MrSemperfit
@MrSemperfit 12 жыл бұрын
who disliked this?!?!?!?!
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