A man stands 5m in front of a large mirror . How far must he walk before he is 5m away from his image?
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distance from mirror to image is equal to distance from mirror to object.
∴total distance =5+5
=10m
but he needs to be 5m away
∴5=2x
x=2.5m
∴he needs to walk =5-2.5=2.5m
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