You can't explain prisms without understanding springs | Optics puzzles part 3

2023-11-30

[public] 281K views, 44.0K likes, dislikes audio only

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How the index of refraction arises, and why it depends on color.

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Looking Glass Universe videos on the index of refraction:

https://youtu.be/uo3ds0FVpXs

Much of this video is based on the following Feynmann lecture

https://www.feynmanlectures.caltech.edu/I_31.html

The explanation for why the phase of a wave produced by a plane of oscillating charges is a quarter phase behind the wave of a charge in the center of that plane, and hence a quarter phase behind that of a light wave inducing the oscillations, is given in the previous chapter:

https://www.feynmanlectures.caltech.edu/I_30.html

Sections:

0:00 - The standard explanation

3:14 - The plan

5:09 - Phase kicks

8:25 - What causes light?

13:20 - Adding waves

16:40 - Modeling the charge oscillation

20:59 - The driven harmonic oscillator

26:57 - End notes

Thanks to these viewers for their contributions to translations

German: Ole

Hebrew: Alon Altman, Omer Tuchfeld

Hindi: Saurabh

Portuguese: @doryhelioaires

Urdu: Momini0

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https://3b1b.co/faq#manim

https://github.com/3b1b/manim

https://github.com/ManimCommunity/manim/

All code for specific videos is visible here:

https://github.com/3b1b/videos/

The music is by Vincent Rubinetti.

https://www.vincentrubinetti.com

https://vincerubinetti.bandcamp.com/album/the-music-of-3blue1brown

https://open.spotify.com/album/1dVyjwS8FBqXhRunaG5W5u

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