Question

A 6 metre 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 15 cm and its sharp image is formed at a distance of 30 M from it on a screen placed on the other side of the lens. If the object is now moved a little away from the lens in which direction (towards the lens or away from the lens) will have to move the screen to get a sharp image of the object on it again? How is a magnification of the image be affected?

Answer 1

Move the screen towards the lens to get sharp image.
It's magnification will decrease