Question

3. One half of a convex lens of focal length 20 cm covered with a black paper.
(i) Will the lens produce a complete image of the object?
(ii) Show the formation of image of an object placed at 2F1 of such covered lens with the
help of a ray diagram.
(iii) How will the intensity of image formed by half-covered lens compare with non-covered
lens?

Answer 1

1. It produce but brightness of image will be less