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An initially parallel cylindrical beam travels in a medium of refractive index . The speed of light in the medium is:

  1. A
    minimum on the axis of the beam
  2. B
    the same everywhere in the beam
  3. C
    directly proportional to the intensity
  4. D
    maximum on the axis of the beam

Solution & Step-by-step Explanation

Speed of light in a medium is .Given .On the axis of the beam, the intensity is maximum. Therefore, is maximum on the axis.Since is maximum, the speed must be minimum on the axis.

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An initially parallel cylindrical beam travels in a medium of refractive index . The speed of light in the medium is:
A
minimum on the axis of the beam
B
the same everywhere in the beam
C
directly proportional to the intensity
D
maximum on the axis of the beam

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