I NEED THE ANSWER NOW..PLS.. A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the
lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens,in which way will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?