Question

The critical angle of a medium with respect to air is 45 degree. The refractive index of medium is

Answer 1

Answer: √2

Explanation:

This is a case of Total Internal Reflection, here the relation between critical angle (θc) and refractive index (n) is given as

θc = sin-1(1/n)

here θc = 45o, so n is

  n = 1/sinθc = √2

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