An initially parallel cylindrical beam travels in a medium of refractive index $\mu(I) = \mu_0 + \mu_2I$,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
- Amaximum on the axis of the beam
- Bminimum on the axis of the beam
- Cthe same everywhere in the beam
- Ddirectly proportional to the intensity $I$
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