A boy with a mouth 5 cm wide stands 3 cm from a plane mirror. where is his image and how wide is the image of his mouth? he walks towards the second at 2m/s . at what speed does his image approach him?
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(a) The image will form 3 m behind the mirror and the width of the image of boy's mouth will be 5 cm.
(b) When the boy walks towards the mirror at a speed of 2 m/s, his image will also appear to move towards the mirror at the same speed of 2 m/s. So, the speed at which his image approach him will be 3 m/s + 3 m/s = 6m/s.
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