Snell's laws proof using Huygen's principle | Wave optics | Physics | Khan Academy
Channel: Khan Academy India - English
Date: 2020-11-04

Huygen's principle states that every point on a wavefront behaves as a source for secondary waves, whose common tangent (envelop) becomes the new wavefront. Using this principle, let's prove Snell's law of refraction - Ratio of the sine of angle of incidence to the sine of the angle of refraction is a constant. 


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