An infinity long rod lies along the axis...

An infinity long rod lies along the axis of a concave mirrror of focal length f.The near end of a the rod is at a distance `ugtf` from the mirror ,Its image will have a length:

`f^2/(u-f)`

`(uf)/(u-f)`

`f^2/(u+f)`

`(uf)/(u+f)`

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