An initially parallel cylindrical beam travels in a medium of refractive index µ(I)=µ0+µ2I, where µ0 and µ2 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

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Correct Answer is : minimum on the axis of the beam

AIEEE 2010 Solved Paper