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Questions  >>  CBSE XI  >>  Math  >>  Conic Sections
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Q)

If the parabola $y^2=4ax$ passes through the point $(3,2)$,then the length of its latus rectum is

$\begin{array}{1 1}\large\frac{2}{3}\\\large\frac{4}{3}\\\large\frac{1}{3}\\4\end{array} $

Your ans and concept are wrong the write ans is 4/3 and length of latusrectum is 4a not 2a

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A)
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  • If the equation of the parabola is $y^2=4ax$ ,then the length of the latus rectum is $2a$
Answer : $\large\frac{2}{3}$
It is given that the parabola passes through the point $(3,2)$
Length of its latus rectum is $2a$
$y^2=4ax$
(ie) $(2)^2=4a(3)$
$\Rightarrow a=\large\frac{1}{3}$
$\therefore$ Length of the latus rectum is $2\times \large\frac{1}{3}=\frac{2}{3}$
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