Question

a man stand 10 m in front of a large plain mirror how far must he walk before he is 5 m away from his image​

Answer 1

Answer:

In a plane mirror the image is virtual. It appears the same distance behind the mirror as the object is in front and that is the law of reflection.

Therefore, to have 5 meter distance between him and the image, the virtual distance of the virtual image behind the mirror should be equal to the real distance between the man and mirror .  Therefore the man sholul stand 5/2 meter before the mirror to have 5 feet distance between him and his image. That meanes he should walk by another 7.5 meter towards the mirror  in a direction perpendicular to the mirror surface or along the line of man and image line.

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-Viswajeet

Answer 2

2m large plane mirror