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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

convex

B

concave

C

convex near the axis and concave near the periphery

D

planar

Text Solution

Verified by Experts

The correct Answer is:
D
Beam does not converge or diverge so phape of wave front remain planar.
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