Physics 11.2.3a - Snell`s Law

[derekowens]

In geometry, we learn that vertical angles are equal. The angles formed from refraction, though, are not exactly vertical angles. Both pairs of rays have to be directly opposite each other for them to be vertical angles. When there is refraction, one of them is bent.

[derekowens]

Yes, thank you, and thank you. I'll fix this video (eventually) and re-upload. Snellius was Dutch. Very glad you like the videos!

[derekowens]

@lollivaleriepop Going from air to water, the light would slow down and bend toward the normal. Going from glass to water, the light would speed up and bend away. So it depends on the relative IOR's of the two materials.

[dachick]

Love your videos!!! I'm studying for the MCAT and they are soooo helpful!!! Thank you!

[EugenMihailescu]

Hi Derek,
Helpfull videos btw. One comment though, Willebrord Snellius was a Dutch astronomer and mathematician not British. Thank you for all these materials, we need more teachers like you (meaning people who understand behinde the formulas, who really like the subject and who know to teach/explain).

[derekowens]

That's correct. I typically round off the .000293, though, unless I'm refracting between air and space.

[derekowens]

@27siddarth Yes, but we round that to 1.00, and that's close enough when we're refracting from say, air into glass. If we were refracting between air and space, the .0003 would be significant.

[javagao]

Very clear and good explanation. Cheers from Brazil

[derekowens]

@Mirko384 Ah, thanks very much for the correction. I'll put the re-recording of this lecture on my to do list.
Thanks,
DO

[VipericVampire]

Hello,

Would you mind explaining me why two mediums with a similar index of refection will make the object that is put inside them (like a beaker in a Pyrex test tube filled with oil) invisible to the eye?

[lollivaleriepop]

shouldn't the refracted ray in water bend away from the normal ?

[misssweethearted]

how do you know if the refracted angle bends towards the normal or away from it? if its more dense it bends toward it? ahh i dont remember :/ great video though

[Arbyit]

lol got a final tomorrow, hopefully this helps

[mupo]

nit explanations

I as a english languge teacher am learning from these videos

[Rootbeer]

Thank you so much. My teacher cannot teach...