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Question

What is meant by the term 'critical angle'? How is it related to the refractive index of the medium?


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Solution

Critical angle:

  1. The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.

Mathematically, the relation between the critical angle and the refractive index of the medium can be represented below.

(aμg)=cosecic

Here,

aμg is the refractive index of the medium.

ic is the critical angle.


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