100 Replies to “Refraction and Snell’s law | Geometric optics | Physics | Khan Academy”

  1. A verry good job #Mr.khan. You know the most interesting thing is the using of colourfull pens. Students find it more attractive :P.

  2. Thank you so much. Your videos explain everything in perfect detail! The car analogy is so amazing! Thanks!!!!

  3. i think you're wrong when light from water goes into air it should be moving away from the normal line

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  5. snell was not the first to discover the law of refraction, in fact, Ibn Sahl, an Egyptian scientist who is the first to discover this but unfortunatly they gave the credit to snell

  6. So Snell's law and index of refraction is just a generalization unless you can quantify the index. How do you solve for the unknown, factor? Science gives us Standard Refraction, a meaningless number that does not account for the temperatures and densities of different gasses and pollution in the atmosphere and how light propagates through them. For any given day, time, location, you cannot know the amount of or make up of pollution and gasses in the atmosphere so standard refraction cannot work. I'm trying to understand how Snell's law and standard refraction relate.

  7. So helpful.
    Also is this implying that light has individual widths that cause the car turn? Are those individual photons? Are they connected. God physics is annoying . I love it but you answer one question and have 19 more.

  8. Someone who can answer this????
    A ray of light passes from medium 1 to medium 2 to medium 3. The index of refraction in medium 1 is n1, in medium 2 it is n2> n1, and in medium 3 it is n3>n2. Explain how that medium 2 can be ignored when calculating the angle of refraction in medium 3; that is, show that n1sintheta 1 = n3sintheta 3?

  9. you could have explained sound wave as the longitudinal wave. OK let me explain sound wave is a longitudinal wave. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.

  10. Just first talk slowly in other can understand in this video I am not getting what you are speaking how can I understand what you are teaching

  11. The example of the car was amazing.. never thought that would be similarised with the traveling of light..lol

  12. The car example makes sense. But light is NOT matter. I cannot understand why will a denser medium slow it down in the first place?

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