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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:

1. lies between √2 and 1
2. lies between 2 and √2
3. is less than 1
4. is greater than 2

Correct answer: is greater than 2

Solution

For the angle of minimum deviation to equal the refracting angle, the refractive index of the prism must be high. This condition is satisfied when the refractive index is greater than 2.

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