Question

What happens to the image formed by a convex lens if it's lower part is blackened?

Answer 1

Every part of a lens forms a complete image. If the lower part of the lens is blackened the complete image will be formed . In this case, although the image will form it would be less intense or its won't be as bright as with the full lens. .

Answer 2

Every part of a lens forms a complete image. If the lower part of the lens is
blackened the complete image will be formed but its intensity will be decreased.