An object is placed at a distance of 15 cm froma convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such thatthe image formed by the combination coincideswith the object itself. The focal length of theconvex mirror iS(1) 20 cm (2) 10 cm (3) 15 cm (4) 30 cm

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