A point object O is placed at a distance...

A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm as shown in figure. At what distance x from the lens should a concave mirror of focal length 60 cm, placed so that final image coincides with the object ?

10 cm

40 cm

20 cm

final image can never coincide with the object in the given conditions

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