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A convex lens and a convex mirror of rad...

A convex lens and a convex mirror of radius of curvature `20 cm` are placed co-axially with the convex mirror placed at a distance of `30 cm` from the lens. For a point object at a distance of `25 cm` from the lens, the final image due to this combination coincides with the object itself. What is the focal length of convex lens ?

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