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Light Reflection and Refraction
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08/08/2021 2:06 pm
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(a) A boy with a mouth 5 cm wide stands 2 m away from a plane mirror. Where is his image and how wide is the image of his mouth?
(b) The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?
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08/08/2021 2:07 pm
(a) The image will form 2 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 1 m/s, his image will also appear to move towards the mirror at the same speed of 1 m/s. So, the speed at which his image approach him will be 2 m/s + 2 m/s
= 4 m/s.