A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black
(i) The image will be shifted downward

(ii) The image will be shifted upward

(iii)The image will not be shifted

(iv) The intensity of the image will decrease

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(i), (iii)

(ii), (iii)

(i), (ii)

(iii), (iv)

answer is D.

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Detailed Solution

Every portion of the lens acts as a individual lens when it is made with same material. So, if the some of the portion of the lens is painted black rest of the portion acts has a lens, so image will not be shifted but its intensity will decrease.

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