Question

Use huygen's principle to show how a plain wave front propagate from a denser to rarer medium. hence verify snells law of refrection

Answer 1

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Use Huygens' geometrical construction to show the propagation of plane wave front from a rarer medium 
Use Huygens' principle to show the propagation of a plane wavefront from a denser medium to a rarer medium. Hence find the ratio of the speeds of wavefront in the two media.

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