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 option is 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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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,

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