Physics - Geometrical Optics Question with Solution | TestHub

The apparent depth of water in cylindrical water tank of diameter 2 R cm is reducing at the rate of x $\mathrm{cm}/$ minute when water is being drained out at a constant rate. The amount of water drained in c.c. per minute is ( ${\mathrm{n}}_1=$ refractive index of air, ${\mathrm{n}}_2=$ refractive index of water) :-