Question

How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper?

• A. Full image will be formed but without the central portion
• B. Two images will be formed, one due to each exposed half
• C. No image will be formed
• D. Full image will be formed but it is less bright.

Answer 1

Answer: (D)

Full image will be formed but it is less bright.

Answer 2

Any image is formed by a large number of rays passing from the object. Therefore, if any part of the lens is covered, the brightness of the image will be less as compared to the image formed without wrapping the lens.

Therefore option D) is the correct answer - If the central portion of theconvex lensis wrapped in black paper, then a full image will be formed but it will be less bright.

Convex lens with central portion wrapped in black paper