question_answer

Directions Q. No. 3 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  Solved  Paper-2010

A) travel as a cylindrical beam

B) diverge

C) converge

D) diverge near the axis and converge near the periphery