3Blue1Brown - Snell's law proof using springs

First published at 06:18 UTC on February 20th, 2021.

Stolen from https://youtube.com/watch?v=Iq1a_KJTWJ8 (April 1, 2016)

This is a supplement to the Brachistochrone video, proving Snell's law with a clever little argument by Mark Levi.

CategoryEducation
SensitivityNormal - Content that is suitable for ages 16 and over
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