Question

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 the 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 $2\pi rh$]

• A. $21\%$
• B. $34\%$
• C. $17\%$
• D. $50\%$

Answer 1

Answer: (C)