An initially parallel cylindrical beam travels in a medium of refractive index mu(I) = mu_(0) + mu_(2)I, 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. The initial shape of the wavefront of the beam is :

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_(2)I, 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. The initial shape of the wavefront of the beam is :
Answer» PLANAR convex concave convex NEAR the axis and concave near the periphery. Solution :(a) Since the beam is PARALLEL `THEREFORE` the wavefront is planar.

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