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  • Question is based on the following paragraph. An initially parallel cylindrical beam travels in a medium of refractive index  <img alt="\mu (I)=\mu _{0}+\mu _{2}I,where\;\mu _{0}\; a

Question is based on the following paragraph.

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.

Question: As the beam enters the medium, it will

Option: 1

Travel as a cylindrical beam


Option: 2

Diverge    


Option: 3

Converge


Option: 4

Diverge near the axis and converge near the periphery


Answers (1)

best_answer

 Intensity of beam decreasesing means \mu (I) decreasing as we move away from central region 

As the beam enters the medium , \mu will be maximum and speed will be minimum on the axis of the beam so the beam will converge 

 

Posted by

Ritika Kankaria

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