If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is

The minimum distance between an object and its real image formed by a convex lens of focal length f is

The minimum distance between an object and its real image formed by a convex lens of focal length 'f' is

The least distance between a point object and its real image formed by a convex lens of focal length F is

The minimum distance between an object and its real image formed by a thin convex lens of focal length f is K.f . Find the value of K .

An object is placed at a distance of f/2 from a convex lens of focal length f. The image will be