An initially parallel cylindrical beam travels in a medium of refractive index … where … and … are positive constants and … 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

Option B. In the medium, the refractive index will decreases from the axis forwards the periphery of the beam.

Geometrical Optics

JEE Main 2010 · Annual, Paper 1 · Q7094

PhysicsMedium105×since 2002Q7094

An initially parallel cylindrical beam travels in a medium of refractive index

\mu \left( I \right) = {\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