NCERT Exercise 9.3 - Ray Optics and Optical Instruments
Question: A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?
Answer: **NCERT answer:** 1.33; 1.7 cm
Full step-by-step NCERT solution with diagrams on Something by Zero.