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Image Formation by a Plane Mirror

A man standin...

Question

A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror ?

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Solution

Distance between man and his image = 6m
Distance between man and mirror + distance between mirror and image = 6m
But, Distance between man and mirror (object distance) = distance between mirror and image (image distance)
Therefore, distance of man from mirror = $\frac{6}{2}$ = 3 m

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