The power of a lens
(A) Is reciprocal of its focal length
(B) Is positive if it is a convex lens
(C) Is negative if it is a concave lens
(D) Is measured in Diopter
(A) Is reciprocal of its focal length
(B) Is positive if it is a convex lens
(C) Is negative if it is a concave lens
(D) Is measured in Diopter