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. The speed of light in the medium is

Option A. The speed of light … in a medium of refractive index … is given by

Geometrical Optics

JEE Main 2010 · Annual, Paper 1 · Q7093

PhysicsMedium105×since 2002Q7093

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. The speed of light in the medium is