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Q.

Lower half of a concave mirror’s reflecting surface is covered with an opaque material. When an object is placed in front of it

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a

The intensity of the image becomes double

b

The intensity of image reduces

c

The image is not formed at all

d

Only half image is visible

answer is B.

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Detailed Solution

Covering the surface of mirror does not change the focal length of the mirror, So the position and magnification of the image will be same. 

But the opaque layer will obstruct some of the photons that forms the image, so the intensity of the image will be decreased.

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