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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

When a ray of light falls on a given plate at an angle of incidence the reflected and refracted rays are found to be normal to each other. The refractive index of the material of the plate is

Answer: (C)

Solution

Reflected and refracted rays normal to each other gives , so and \sin\sin$

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Question ID VK-069307