JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Hyperbola

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Let be a point on the hyperbola . If the normal at the point intersects the -axis at , then the eccentricity of the hyperbola is
  1. (A)
  2. (B)✓ Correct
  3. (C)
  4. (D)

Answer: (B)

Solution

The point lies on the hyperbola, so .

The equation of the normal at on the hyperbola is .

At , the normal is .

The slope of the normal is .

The normal passes through , so .

Substituting : , giving , so .

The eccentricity .

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Single correct option

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