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

माना एक अतिपरवलय की नाभियाँ \((1,14)\) और \((1,-12)\) हैं। यदि यह बिंदु \((1,6)\) से होकर गुजरता है, तो इसके नाभिलंब की लंबाई __________ है।

  1. A \(\frac{24}{5}\)
  2. B \(\frac{25}{6}\)
  3. C \(\frac{144}{5}\)
  4. D \(\frac{288}{5}\)
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Answer & Solution

Correct Answer

(D) \(\frac{288}{5}\)

Step-by-step Solution

Detailed explanation

\(\begin{aligned} & \mathrm{be}=13, \mathrm{~b}=5 \\ & \mathrm{a}^2=\mathrm{b}^2\left(\mathrm{e}^2-1\right) \\ & =\mathrm{b}^2 \mathrm{e}^2-\mathrm{b}^2 \\ & =169-25=144 \\ & \ell(\text { LR })=\frac{2 \mathrm{a}^2}{\mathrm{~b}}=\frac{2 \times 144}{5}=\frac{288}{5}\end{aligned}\)
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