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Convex Lens

A convex lens...

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A convex lens forms a real image of point object at a dis†an ve of 50cm from the convex lens.A concabe lens is places 10cm behind the convex lens on the image side. On placing a plane mirror on the image side and facing the concave lens, it is observed that the final image now coincides with the object itself. the focal lenght of the concave lens is?

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