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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

When a ray of light enters a medium of refractive index , then it is observed that the angle of refraction is half the angle of incidence. The value of angle of incidence will be

Answer: (D)

Solution

With r = i/2, μ = sin i/sin(i/2) = 2cos(i/2), so i = 2cos⁻¹(μ/2); the sine form in (a) gives a

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Question ID VK-076948