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A convex lens is held \( 45 \mathrm{~cm} \) above the bottom of an empty tank. The image of a point at the bottom of a tank is formed \( 36 \mathrm{~cm} \) above the lens. Now, a liquid is poured into the tank to a depth of \( 40 \mathrm{~cm} \). It is found that the distance of thr image of the same point on the bottom of the tank is \( 48 \mathrm{~cm} \) above the lens. Find the refractive lex of the liquid.
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