There is a small source of light at some depth below the surface of water (refractive index=43), in a tank of large cross-sectional surface area. Neglecting any reflection from the bottom and absorption by water, the percentage of light that emerges out of the surface is (nearly):[use the fact that surface area of a spherical cap of height h and radius of curvature r is 2πrh]

There is a small source of light at some depth below the surface of wa

1.	There is a small source of light at some depth below the surface of water (refractive index=43), in a tank of large cross-sectional surface area. Neglecting any reflection from the bottom and absorption by water, the percentage of light that emerges out of the surface is (nearly):[use the fact that surface area of a spherical cap of height h and radius of curvature r is 2πrh]
Answer» There is a small source of light at some depth below the surface of water $(refractive index=43)$ , in a tank of large cross-sectional surface area. Neglecting any reflection from the bottom and absorption by water, the percentage of light that emerges out of the surface is (nearly): [use the fact that surface area of a spherical cap of height $h$ and radius of curvature $r$ is $2 π r h$ ]

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