For prism of refractive index 1.732, the angle of minimum deviation is equal to the angle of the prism. The angle of the prism is
A
80o
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B
70o
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C
60o
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D
50o
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Solution
The correct option is C 60o We know that the refractive index (μ) of a prism is related to the prism angle (A) and the minimum deviation angle (Dm) by the relation μ=sinA+Dm2sinA2
Given that the minimum deviation angle and the prism angle are equal. i.e., A=Dm and