Reflection laws proof using Huygen's principle | Wave optics | Physics | Khan Academy

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 the laws of reflection
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Created by Mahesh Shenoy

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Huygen says...

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But the angle between i&r is 90

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0:36

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1:40

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