A circular disc of diameter 7 cm lies horizontally inside a metallic hemispherical bowl of diameter 25 cm. The disc is just visible to an eye looking over the edge as shown in the figure. The bowl is now filled with a liquid. It is observed that, the whole of the disc is just visible to the eye in the same position. Find the refractive index µ of the liquid.
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μ = 4/3
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