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  4. The critical angle of a prism is 41.8° . What should be the refracting angle of a prism, so that a ray after grazing incidence over one lace emerges grazing over the other face?

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Q. The critical angle of a prism is $ 41.8{}^\circ $ . What should be the refracting angle of a prism, so that a ray after grazing incidence over one lace emerges grazing over the other face?

JIPMERJIPMER 1997

Solution:

Correct answer is (b) $ 83.6{}^\circ $