A boy is observing his image in a plane mirror. The distance between the mirror and his image is 6m. If he moves 2m towards the mirror, then the distance between the boy and his image will be:
A
6m
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B
4m
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C
8m
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D
2m
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Solution
The correct option is C8m Initially, the boy is at B1. In a plane mirror, the image B′1 is at the same distance behind the mirror as the object is in front of the mirror. When he moves 2m towards the mirror, the image will shift to the position B′2 as shown in the figure. Now the distance from the mirror to B2 is 4m and the distance from the mirror toB′2 is 4m. And hence, the current distance between the boy and his image becomes equal to 8m, as evident from the figure below.