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 ?

Height of mouth = 5cm

Mouth mirror distance = 2m


Second law of reflection says, angle of incidence is equal to the angle of reflection.


Thus, the image will form 2 m behind the mirror and the width of the image of boy's mouth will be 5 cm.


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