What is HUYGENS PRINCIPLE and explain how law of refraction is stablished on the basis of hygens wave theory
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every point on a propagating wavefront serves as the source of spherical secondary wavelets, such that the wavefront at some later time is the envelope of these wavelets. If the propagating wave has a frequency, f, and is transmitted through the medium at a speed, v, then the secondary wavelets will have the same frequencies and speed
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