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The locus of the midpoints of the line j...

The locus of the midpoints of the line joining the focus and any point on the parabola `y^(2)=4ax` is a parabola with the equation of directrix as

A

x=0

B

`x=(a)/(2)`

C

`x+a=0`

D

`2x+a=0`

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A
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