Questions number 86-88 are based on the following paragraph : An initialy parallel cylindircal beam travels in a medium of refractive index mu (I) = mu_(0) + mu_(2)I, where mu_(0) and mu(2) are positive constant and I is the intensity of the light beam.The intensity of the bema is decreasing with increasing radius. 86. The initial shape of the wavefront of the beam is:

Questions number 86-88 are based on the following paragraph : An init

1.	Questions number 86-88 are based on the following paragraph : An initialy parallel cylindircal beam travels in a medium of refractive index mu (I) = mu_(0) + mu_(2)I, where mu_(0) and mu(2) are positive constant and I is the intensity of the light beam.The intensity of the bema is decreasing with increasing radius. 86. The initial shape of the wavefront of the beam is:
Answer» PLANAR convex concave convex NEAR he AXIS and concave near the periphery. Solution :SINCE the beam is paralle `THEREFORE` the wavefront is planar.

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