NCERT Example 9.4 - 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 at the bottom is measured as 9.4 cm by a microscope. What is the refractive index of water? If water is replaced by a liquid of μ = 1.63, find the new apparent depth.
Answer: μ_water = **1.33**; new apparent depth = **7.67 cm**.
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