AB is incident wavefront on mirror R and mirror S whereas PQ and P'Q' is reflected wavefront from mirror R and mirror S respectively. Choose the correct statement .

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AB is incident wavefront on mirror R and mirror S whereas PQ and P'Q' is reflected wavefront from mirror R and mirror S respectively. Choose the correct statement .

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mirror R is concave and mirror S is convex

Mirror R is plane and mirror S is convex

mirror R is convex and mirror S is plane

mirror R is plane and mirror S is concave

answer is C.

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Detailed Solution

After reflection from plane shape of the wavefront does not change, so spherical wavefront remains spherical.

For spherical mirror, the shape of the wavefront changes. Here, incident wavefront is concave inward and the reflected wavefront is plane. So, the mirror must be concave mirror.

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