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JEE Main 9 Jan 2020 Shift 2 Solved Paper

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Question : 10

Total: 75

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 2 πrh]:

17%
21%
34%
50%

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