Railways
Sample Paper
RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-20
question_answer
A mark is made on the bottom of a beaker when it is empty and a microscope is focused on the mark. The microscope is then raised through 3 cm. To what height must water be poured in the beaker in order to bring the mark again in focus? (refractive index of water is 4/3)