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An equi-convex lens of (mu=3//2) and foc...

An equi-convex lens of `(mu=3//2)` and focal length 10 cm is held with its axis vertical and its lower surface immersed in water `(mu=4//3)`, the upper surface being in air. At what distance from the lens, will a vertical beam of parallel light incident of the lens be focused?

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