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?
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The distance between David and the mirror is equal to the distance between the mirror and his image. When he moves 1 m towards the mirror, he is at a distance of 3m (4m - 1m) from the mirror. Thus, the distance between David and his image will be = 3m + 3m = 6m.
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