David is observing his image in a plane mirror. The distance between the mirror and his image is 4m. If he moves 1m towards the mirror, then the distance between David and his image will be
A
3m
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B
5m
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C
6m
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D
8m
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Solution
The correct option is C6m Initial seperation between David and his image, x=4m+4m=8m
As David moves 1m towards the mirror, the image also moves 1m towards the mirror.
So, the new seperation between David and his image will be x′=8m−2m=6m.
Hence, option (c) is the correct answer.
Point to remember :- Object distance from a plane mirror is equal to image distancefrom the plane mirror