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Wave Optics
Question
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What is the relation between critical angle and refractive index of a material?

Answer

The relation between critical angle and the refractive index of a material is, 

                  μ = sin ic or n21 = sin ic 

where,
n21 is the refractive index of rarer medium 1 with respect to denser medium 2 and,
ic is the critical angle.

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