The apparent depth of water in cylindrical water tank of diameter `2R cm` is reducing at the rat
Channel: Doubtnut
Date: 2020-01-19

The apparent depth of water in cylindrical water tank of diameter `2R cm` is reducing at the rate of `x cm // min ` 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 )