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Convex Lens

A convex lens...

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A convex lens forms a real and inverted image of a point object at a dis†an ce 50 cm from the convex lens.A concave lens is placed 10 cm 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 finalimage now coincides with the object itself.The focal length of the concave lens is?

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