| 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. |
| The initial shape of the wave front of the beam is - [AIEEE 2010] |
A) planar
B) convex
C) concave
D) convex near the axis and concave near the periphery
Correct Answer: A
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