Question

In order to obtain a magnification of, –3 (minus 3) with a convex lens, the object should be placed:
(a) between optical centre and F
(b) between F and 2F
(c) at 2F
(d) beyond 2F

Answer 1

 Between F and 2F
In the case of a convex lens, for an object placed between F and 2F,  the image formed will be real, inverted and enlarged.