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# The speed of the light in the medium is

Question:

The speed of the light in the medium is :-

1. maximum on the axis of the beam

2. minimum on the axis of the beam

3. the same everywhere in the beam

4. directly proportional to the intensity I

Correct Option: , 2

Solution:

Intensity is maximum at the axis of the cylindrical beam. Hence $\mu$ is maximum at the axis due to the relation $\mu=\mu_{0}+\mu_{2}$ I and $v \propto \frac{1}{\mu}$