A short linear object of length b lies a...

A short linear object of length b lies along the axis of a concave mirror of focal length fat a distance u from the pole of the mirror, what is the size of image?

`b × sqrt((u – f)/f)`

`b × sqrt(f/(u–f))`

`b × ((u – f)/f)`

`b × (f/(u–f))^2`

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