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 \( u \)
\( \mathrm{P} \)
from the mirror. The size of the image is approximately-
(1) \( b\left(\frac{u-f}{f}\right)^{1 / 2} \)
(2) \( b\left(\frac{f}{u-f}\right) \)
(3) \( b\left(\frac{u-f}{f}\right) \)
(4) \( b\left(\frac{f}{u-f}\right)^{2} \)


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