An object AB is placed 15 cm to the left of a convex lens P of focal length $$10 cm$$. Another convex lens Q is now placed $$15 cm$$ right of lens P . If the focal length of lens Q is 15 cm,  final image is______.

A

virtual, formed at 7.5 cm right of lens Q, with a size bigger than that of AB

B

real, formed at 7.5 cm right of lens Q, with a size same as that of AB

C

formed at infinity

D

real, formed at 7 cm right of lens Q, with a size smaller  than  that of AB