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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions

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Question : 8

Total: 99

There is a small source of light at some depth below the surface of water (refractive index =

) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly):
[Use the fact that surface area of a spherical cap of height h and radius of curvature r is 2πrh]

[9 Jan. 2020 II]

21%
34%
17%
50%

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