Short linear object of length \( l \) lies along the axis of a concave mirror of focal length \(...

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Short linear object of length \( l \) 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) \( l\left(\frac{u-f}{f}\right)^{1 / 2} \)
(b) \( l\left(\frac{u-f}{f}\right)^{2} \)
(c) \( l\left(\frac{f}{u-f}\right)^{1 / 2} \)
(d) \( l\left(\frac{f}{u-f}\right)^{2} \)
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