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An initially parallel cylindrical beam t...

An initially parallel cylindrical beam travels in a medium of refractive index `mu(l)=mu_(0)+mu_(2)l`, where `mu_(0)` and `mu_(2)` are positive constants and l is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.
The inital shape of the wave front 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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