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,

the image will be shifted downward

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the image will be shifted upward

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the image will not be shifted

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the intensity of the image will decrease

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Solution

The correct options are
C
the image will not be shifted

D
the intensity of the image will decrease

As we discussed in the video; in such a situation; the focal length remains the same. Hence, the image will not shift and since only half the rays are contributing to the image formation us compared to previous situation; the intensity of the image will decrease.

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Similar questions

Q. 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

(i i)

The image will be shifted upward

(i i i)

The image will not be shifted

(i v)

The intensity of the image will decrease

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(b) the image will be shifted a little later than the object
(c) the image will be shifted a little earlier than the object
(d) the image will not shift

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Q. A convex lens forms an image at the distance

40 c m

on other side of the lens when an object which is placed at

40 c m

away from it . The object is then moved

10 c m

towards the lens then, where will be the image shift?

The centre of curvature of a convex lens is at $40 c m$ and its central portion is wrapped in black paper as shown below. If an object is placed at $90 c m$ , find the nature of image formed.

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