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An intially parallel cyclindrical beam t...

An intially parallel cyclindrical beam travels in a medium of refractive index `mu (I) = mu_(0) + mu_(2) I`, where `mu_(0)` and `mu_(2)` are positive constants and `I` is intensity of light beam. The intensity of the beam is decreasing with increasing radius.
Answer the following questions :
The initial shape of the wavefront of the beam is

A

planar

B

convex

C

concave

D

convex near the axis and concave near the periphery

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The correct Answer is:
A

Parallel cylinderical beam gives planar wavefront
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