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?
i) The image will be complete and inverted
ii)
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iii) The intensity of the image will be halved, because half of the light rays coming from the object is now blocked.
ii)
iii) The intensity of the image will be halved, because half of the light rays coming from the object is now blocked.