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For a genuine parabola, where must the focus be placed relative to the directrix?
ANot on the directrix
BExactly on the directrix
COn the axis at the vertex
DAt the latus rectum midpoint
Answer & Solution
Correct answer: A. Not on the directrix
If the focus lay on the directrix the locus would degenerate into a straight line, so the focus must be off the directrix.
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