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An initially parallel cylindrical beam travels in a medium of refractive index μ (I) = μ0 + μ2 I, 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.
Q. 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 I
  • d)
    maximum on the axis of the beam
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
An initially parallel cylindrical beam travels in a medium of refracti...
The speed of light (c) in a medium of refractive index (μ) is given by
 where c0 is the speed of light in vacuum
As I is decreasing with increasing radius, it is maximum on the axis of the beam. Therefore, c is minimum on the axis of the beam.
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An initially parallel cylindrical beam travels in a medium of refractive index μ (I) = μ0 + μ2 I, 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.Q.The speed of light in the medium isa)minimum on the axis of the beamb)the same everywhere in the beamc)directly proportional to the intensity Id)maximum on the axis of the beamCorrect answer is option 'A'. Can you explain this answer?
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