NEET 2012 Physics question

Physics Ray Optics and Optical Instruments NEET 2012

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)is greater than 2
(2)lies between and 1
(3)lies between 2 and Correct
(4)is less than 1

Answer: (3)

Solution

For a prism, . Putting : . The angle of incidence at minimum deviation is , and it cannot exceed , so \le$

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Question ID VK-091081