Question

A girl of height 150 cm is standing 15 m away from the plane mirror . What will be the distance between the girl and her image ?​

Answer 1

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It does not matter how far you are from the mirror. In order to see full image of a person, the minimum size of the mirror should be one half the person's height. This is so because, in reflection, the angle of incidence is equal to angle of reflection. So, to see the image of a 6 ft tall person, a 3 ft long mirror is required.

Answer 2

Answer:

If distance of Person to plane mirror=5 m.

Then distance of image to plane mirror=5m.

Then distance of Person to image=

distance of Person to plane mirror+distance of image to plane mirror.

5m.+5m.

Then distance of Person to image=10m