Question

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

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

Answer 1

Answer: (B)

Any portion of the lens acts as a whole lens, as far as forming the image. A smaller portion of a lens forms an image of lesser intensity.