For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index :

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is less than 1

is greater than 2

lies between 2 and 1

lies between 2 and 2

answer is D.

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Detailed Solution

Dm=Aμ=Sin2A2Sin A/2=2sinA/2 cosA/2sinA/2 μ2=cosA/2 If A=90o,μ=2If A=0, μ=2So μ lies between 2 and 2

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