A plano-convex lens (mu = 3/2) has a rad...

A plano-convex lens `(mu = 3/2)` has a radius of curvature R = 15 cm and is placed at a distance z from a concave lens of focal length 20 cm as shown . At what distance `x_(0)` should a point object be placed from the plano-convex lens, so that position of the final image is independent of z?

20 cm

30 cm

40 cm

60 cm

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