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An initially parallel cylindrical beam travels in a medium of refractive index (I)= ₀+ ₂ I , where ₀ and ₂ 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

Options

  1. Aminimum on the axis of the beam
  2. Bthe same everywhere in the beam
  3. Cdirectly proportional to the intensity I
  4. Dmaximum on the axis of the beam

Correct answer

A. minimum on the axis of the beam

Step-by-step solution

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