Question

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 initial shape of the wave front of the beam is

• A. Convex
• B. Concave
• C. Convex near the axis and concave near the periphery
• D. Planar

Answer 1

The correct option is D Planar

For a parallel cylinderical beam, wavefront will be planar.