JEE Advanced · 2009 · 12 Apr 2009 · Paper 2 · Ellipse

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The normal at a point on the ellipse meets the -axis at . If is the mid point of the line segment , then the locus of intersects the latus rectums of the given ellipse at the points
  1. (A)
  2. (B)
  3. (C)✓ Correct
  4. (D)

Answer: (C)

Solution

The ellipse is , so , .

Let . The normal at is:


At the -axis (): , so .

The midpoint satisfies:


From these: , .

Using :


The latus rectum of the ellipse is at .

Substituting into the locus:


Therefore, the points are .

JEE Advanced · 2009 · 12 Apr 2009 · Paper 2 · Single correct option

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