An initially parallel cylindrical beam travels in a medium of refractive index `mu(I)=mu_0+mu_2I`, where `mu_0` and `mu_2` are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. 31. The initial shape of the wavefront of the beam isA. planarB. convexC. concaveD. covnex near of the axis and concave near the periphery.

An initially parallel cylindrical beam travels in a medium of refracti

1.	An initially parallel cylindrical beam travels in a medium of refractive index `mu(I)=mu_0+mu_2I`, where `mu_0` and `mu_2` are positive constants and I is the intensity of the light beam. The intensity of the beam is decreasing with increasing radius. 31. The initial shape of the wavefront of the beam isA. planarB. convexC. concaveD. covnex near of the axis and concave near the periphery.
Answer» Correct Answer - 1 Since rays are parallel ,so wavefront mustbe planar.

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