An object is placed before a convex lens and its real image is obtained. Now if half of the surface is covered with paper. The result will be:

Full image will be formed with less brightness

The correct answer is Option (4) → Full image will be formed with less brightness

If half of the surface of the convex lens is covered with paper a real but dimmer image will still be formed, and it may lose some sharpness or clarity due to reduced light.