An object is placed in front of a convex lens in such a way that its real and magnified image is formed on the other side. If the top half of the convex lens is covered with a black/opaque paper then-
1
the image magnification will be reduced.
2
the top half of the image will vanish.
3
the bottom half of the image will vanish.
4
the sharpness of the image will be reduced.