How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper?
Convex lens
Formation of image when the central portion is wrapped in black paper
Diagram
From the figure, it is clear that in case of the lens with black paper wrapped, less number of rays will pass and hence the image will have less intensity compared to the image formed by the mirror without any wrapping.
So, the image will be formed but it has less brightness.