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  4. If the lower half of a concave mirror's reflecting surface is made opaque, which of the following statements describe the image of an object placed in front of the mirror? S1: Intensity of the image will increase. S2: The image will show only half of the object. S3: No change in the image S4: Intensity of the image will be reduced to half.

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Q. If the lower half of a concave mirror's reflecting surface is made opaque, which of the following statements describe the image of an object placed in front of the mirror?
S1 : Intensity of the image will increase.
S2 : The image will show only half of the object.
S3 : No change in the image
S4 : Intensity of the image will be reduced to half.

Ray Optics and Optical Instruments

Solution:

As laws of reflection to be true for all points of the remaining part of the mirror, the image will be that of the whole object. However, as the area of the reflecting surface has been reduced, the intensity of the image will reduce (in this case to half).