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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

यदि \(OB\), एक दीर्घवृत्त का अर्ध लघुअक्ष है, \(F _{1}\) तथा \(F _{2}\) उसकी नाभियाँ हैं तथा \(F _{1} B\) तथा \(F _{2} B\) के बीच का कोण एक समकोण है, तो दीर्घवृत्त की उत्केंद्रता का वर्ग है

  1. A \(\frac{1}{2}\)
  2. B \(\frac{1}{{\sqrt 2 }}\)
  3. C \(\frac{1}{{2\sqrt 2 }}\)
  4. D \(\frac{1}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{1}{2}\)

Step-by-step Solution

Detailed explanation

Let \(\frac{{{x^2}}}{{{a^2}}} + \frac{{{y^2}}}{{{b^2}}} = 1\) be he equation of ellipse. Given that \({F_1}B\) and \({F_2}B\) are perpandicluar to each other. Slope of \({F_1}B \times \) alop of \({F_2}B = - 1\)…
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