A short linear object of length \( b \) lies along the axis of a concave mirror of focal length ...

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A short linear object of length \( b \) lies along the axis of a concave mirror of focal length \( f \) at a distance \( u \) from the pole of the mirror. The size of the image is approximately equal to :
(A) \( b\left(\frac{u-f}{f}\right)^{1 / 2} \)
(B) \( b\left(\frac{f}{u-f}\right)^{1 / 2} \)
(C) \( b\left(\frac{u-f}{f}\right) \)
(D) \( b\left(\frac{f}{u-f}\right)^{2} \)
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