TimbaLanD Posted September 6, 2007 Posted September 6, 2007 Refraction. Why do light always bends towards the normal when entering from one medium to the other? Why not away from the normal?
Klaynos Posted September 6, 2007 Posted September 6, 2007 It doesn't. It depends on the refractive indexes of the two materials. It is controld by snell's law. Which can be derived from Fermats least time principle. http://en.wikipedia.org/wiki/Snell%27s_Law http://en.wikipedia.org/wiki/Fermat%27s_principle
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