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The refractive index of the material of a prism is 2 and its refracting angle is 30^ . One of the refracting surface of the prism is made a mirror inward. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface if its angle of incidence on the prism is:

Options

  1. A45^
  2. B60^
  3. C0
  4. D30^

Correct answer

A. 45^

Step-by-step solution

Here r=30^ (Using law of triangle) aligned & = i r & 2 30^ = i & i= 1 2 & i=45^ aligned

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