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A plano convex glass lens (mu(g) = 3//2)...

A plano convex glass lens `(mu_(g) = 3//2)` of radius curvature `R = 10 cm` is placed at a distance of b from a concave lens of focal length 20 cm. what should the distance 'a' of a point object O from the plat convex lens so that the position of final image always at same distance from concave lens

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