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An initially parallel cylindrical beam t...

An initially parallel cylindrical beam travels in a medium of refractive index `mu(I)=mu_0+mu_2I`, where `mu_0` and `mu_2` are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
31. The initial shape of the wavefront of the beam is

A

Convex

B

Concave

C

Convex near the axis and concave near the periphery

D

Planar

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The correct Answer is:
D
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