Where should an object be placed in front of a convex lens to get a real image of the size of the object? (a) At the principal focus of the lens (b) At twice the focal length (c) At infinity (d ) Between the optical centre of the lens and its principal focus
(b) At twice the focal length The object should be placed at twice the focal length in front of a convex lens to get a real image of the size of the object.
