An initially parallel cylindrical beam travels in a medium of refractive index μ(I) = μ₀ + μ₂I, 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. The initial shape of the wave front of the beam is?<p></p>

An initially parallel cylindrical beam travels in a medium of refractive index μ(I) = μ₀ + μ₂I, 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. The initial shape of the wave front of the beam is?

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