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?

A tank is filled with water to a height of 12.5 cm. The apparent depth

1.	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» `mu=1.33,d=1.7 CM` `mu=1.33,d=7.7cm` `mu=1.33,d=9.4cm` `mu=1.33,d=17.1 cm` SOLUTION : `mu=1.33,d=1.7cm`

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