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The locus of the point of intersection of tangents drawn at the extremities of a normal chord to the parabola `y^2=4ax` is the curveA. x=aB. x=-aC. y=aD. y=-a |
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Answer» Correct Answer - B From illustration 4, we have `m_(1)m_(2)=a/h` If the tangents are perpndicular, then `m_(1)m_(2)=-1rArra/h=-1rArrh=-a` Hence, the locus of (h, k) is x=-a, which is the directrix of the parabla. |
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