The apparent depth of water in cylindrical water tank of diameter 2Rcm is reducing at the rate of xcm//mi n ute when water is being drained out at a constant rate. The amount of water drained in c.c per minute is (n_1= refractive index of air n_2= refractive index of water).

The apparent depth of water in cylindrical water tank of diameter 2Rcm

1.	The apparent depth of water in cylindrical water tank of diameter 2Rcm is reducing at the rate of xcm//mi n ute when water is being drained out at a constant rate. The amount of water drained in c.c per minute is (n_1= refractive index of air n_2= refractive index of water).
Answer» `(xpiR^2n_1)/n_2` `(XPI R^2 n_2)/n_1` `(2PI Rn_1)/n_2` `piR^2x` ANSWER :B