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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

Rays from a point source of light situated at height 'h' below the liquid surface having refractive index , from a circular patch of light of radius 'r' on the surface. The area of the patch is [MHT-CET 2019]

Answer: (B)

Solution

The patch edge corresponds to the critical angle: with , so and area

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Question ID VK-069532