Question: The speed of the light in the medium is :-
maximum on the axis of the beam
minimum on the axis of the beam
the same everywhere in the beam
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 $v \propto \frac{1}{\mu}$
