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Distance of point A is f/2

Ref image .1

Let A’ is the image of A from mirror, for this image

1v+1−f/2=1−f

1v=2f−1f=1f

Ref image .2

Image of line AB should be perpendicular to the principle axis & image of F will form at infinity, therefore correct image diagram is

Ref image.3

ff−u=h2h1

h2=−f(f−x)−f+x

h2=f.

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