$A$ 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 $9.4 \, cm$. The refractive index of water is .....
- A$1.03$
- B$1.33$
- C$1.75$
- D$2.09$
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MediumNEET 2017
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