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. As the beam enters the medium,it will:
- Atravel as a cylindrical beam
- Bdiverge
- Cconverge
- Ddiverge near the axis and converge near the periphery
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