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An optical system consists of a thin con...

An optical system consists of a thin convex lens ‘L’ of focal length f = 15 cm and a convex mirror M having radius of curvature R=36 cm, arranged co-axially, at a distance of 24 cm. (See Figure below).
Where should an object O be kept so that its inverted image I formed by the lens mirror combination coincides with the object itself?

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