A small bulb (assumed to be a point source) is placed at the bottom of a tank containing
Channel: Doubtnut
Date: 16/08/2020

Please A small bulb (assumed to be a point source) is placed at the bottom of a tank containing water to a depth of `80 cm`. Find out the area of the surface of water through which light from the bulb can emerge. Take the value of refractive index of water to be `4//3`.