If \( b \) and \( c \) are the lengths of the segments of any
\( \m...
If \( b \) and \( c \) are the lengths of the segments of any
\( \mathrm{P} \) focal chord of a parabola \( y^{2}=4 a x \), then length of
W the semi latus rectum is:
(1) \( \frac{b+c}{2} \)
(2) \( \frac{b c}{b+c} \)
(3) \( \frac{2 b c}{b+c} \)
(4) \( \sqrt{b c} \)
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