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 is:
A
8 m
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B
6 m
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C
4 m
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D
2 m
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Solution
The correct option is A 8 m In a plane mirror, distance between the object and the mirror (Do) is equal to the distance between the image and the mirror (Di). It is given that, Di=6m ∴Do=6m. When the boy moves 2m towards the mirror, the distance between the boy and the mirror, D′o=6−2=4m Let the distance between the mirror amd the image in the second situation be D′i=D′o=4m ∴ the distance between the boy and his image D′o+D′i=4+4=8m