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 :
As the beam enters the medium, it will

Options

A. converge
B. diverge near the axis and converge near the periphery
C. travel as a cyclindrical beam
D. diverge

Answer

A

Explanation

As the medium is denser w.r.t. vacuum, therefore, on entering the medium, it will converge.