question_answer

Directions: are based on the following paragraph.

An initially parallel cylindrical 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 the intensity of the light beam. The intensity of the beam is decreasing with increasing radius.

As the beam enters the medium, it will -                                                          [AIEEE 2010]

A) travel as a cylindrical beam

B) diverge

C) converge

D) diverge near the axis and converge near the periphery