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A tank is filled with water to height of...

A tank is filled with water to height of 12.5 cm. The apparent depth of a needl 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 upto the same height, by what distance would the microscope have to be moved to focus on the needle again?

A

1.33, 1.7 cm

B

1.7, 1.33 cm

C

1.33, 7.7 cm

D

1.7, 7.7 cm

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