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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

A parallel beam of monochromatic light is incident on a glass slab at an angle of incidence . Find the ratio of width of beam in glass to that in air (If refractive index of glass is 1.5) is

Answer: (A)

Solution

Beam width of the angle with the normal; with , , so the widths (air : glass) are in

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Question ID VK-077233