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MHT CET Physics question

PhysicsWave OpticsMHT CET

For passage of monochromatic beam of light in a medium of refractive index , the plane wavefront makes an angle of with the refracting surface. The ratio of the width of beam in medium to that in air is

Answer: (B)

Solution

The angle between the wavefront and the surface equals the angle of incidence, so and the width ratio is $

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Question ID VK-077280