Question

the refractive index of material of aprism is √2and the angle of prism is 30° one of the two refracting surfaces of the prism is made a mirror inwards by silver coating a beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface). if its angle of incidence on the prism is ----

Answer 1

please refer this image
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