A plane wavefront travelling in a straig...

A plane wavefront travelling in a straight line in vacuum encounters a medium ofrefractive index m. At P, the shape of the wavefront is

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The correct Answer is:

Velocity of wave in medium `(mu)` is less than that in air. Hence, wave front reaches earlier at P through air.

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CENGAGE PHYSICS ENGLISH-WAVE OPTICS-Single Correct

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