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  4. For the parabola y2=8 x, the length of the latus-rectum is

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Q. For the parabola $y^{2}=8 x$, the length of the latus-rectum is

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Solution:

$y^{2}=8 x \Rightarrow y^{2}=4.2 \, x \Rightarrow a=2$
Length of the latus-rectum $=4 a =8$