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?

Options

A. `mu=1.33,d=1.7 cm`
B. `mu=1.33,d=7.7cm`
C. `mu=1.33,d=9.4cm`
D. `mu=1.33,d=17.1 cm`

Answer

A

Explanation

`mu=1.33,d=1.7cm`