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Question

The locus of the point of trisection of all the double ordinates of the parabola y2=lx is a parabola whose latus rectum is

A
l9
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B
2l9
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C
4l9
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D
l36
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Solution

The correct option is A l9
Given ,
the locus of the point of trisection of all the double ordinate of the parabola y2=Lx
also given, to find out the Latus spection for the given parabola.
as we know that
y2=4ax is the parabola equation.
Let us now equate it with given equation
4ax=Lx
4a=L
A(at2,2at)
we get h=at23k=2at
by squating on betweens we get
9k2=4a2t29k2=4.a2.ha[h=at2t=h/a
9k2=4ahk2=49a.h
y2=L.x=4a9.xy2=L9 Option [A]

1404130_1123439_ans_e52e8106a1de48929cc4ec4a9650d98e.bmp

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