Question bank/JEE Main/Physics

There is a small source of light at some depth below the surface
of water (refractive index =4/3) 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

A50B34C17D21

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[IMAGE] Solid angle [IMAGE] Percentage of light [IMAGE]

Source: Grass-G / P-14 Physics paper 7 Nov.docx