NEET 2004 Physics question
The refractive index of the material of a prism is and its refracting angle is 30. One of the refracting surfaces of the prism is made a mirror inwards. 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 :-
Answer: (4)
Solution
The ray retraces its path only if it strikes the mirrored face normally. For a prism ; with (normal incidence on the mirror), . Snell's law at the first face: $ i = μ =
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