A travelling microscope is focussed on to a scratch on the bottom of a beaker
Channel: Doubtnut
Date: 2020-03-29

A travelling microscope is focussed on to a scratch on the bottom of a beaker. Water of refractive index `(4)/(3)` is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.