A man stands 10m in front of a large plane mirror. How far must the walk before he is 5m away from his image?
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Man should walk 7.5m towards the mirror.
The reason being, the image formed by a plane mirror is the same distance behind the mirror as it is between the object and the mirror. A distance of 5m between man and his image means that the distance between him and the mirror $=\frac{5}{2}\ = 2.5\text{m}$
Thus, the distance he should walk = 10 - 2.5 = 7.5m.
The reason being, the image formed by a plane mirror is the same distance behind the mirror as it is between the object and the mirror. A distance of 5m between man and his image means that the distance between him and the mirror $=\frac{5}{2}\ = 2.5\text{m}$
Thus, the distance he should walk = 10 - 2.5 = 7.5m.
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