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Critical Angle

What is meant...

Question

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

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Solution

Critical angle is the angle of incidence in the denser medium corresponding to which the angle of refraction in rarer medium is $90^{o}$ .
Refractive index of the medium $(_{a} μ_{g}) = c o s e c i_{c}$ , where, $i_{c}$ is the critical angle.

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