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Refraction through a Rectangular Glass Slab

A man stands ...

Question

A man stands $2$ m infront of a plane mirror. The mirror is moved $1$ m towards the man while the man moves $50$ cm away from the mirror. What is the distance between the images of the man?

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Solution

When the man is 2m infront of the mirror ,the image is 2m behind the mirror.
After mirror is moved 1m towards the man and the man moves 50m away from mirror,the effective distance between man and mirror is 51m.
Therefore image formed will be 51m behind the mirror.
Hence the distance between image and object is 102m.

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