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

यदि परवलय \(y^{2}=16 x\) की एक नाभिजीवा का एक छोर \((1,4)\) पर है, तो इस नाभिजीवा की लंबाई

  1. A \(25\)
  2. B \(24\)
  3. C \(22\)
  4. D \(20\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(25\)

Step-by-step Solution

Detailed explanation

\({y^2} = 4ax = 16x \Rightarrow a = 4\) \(A\left( {1,4} \right) \Rightarrow 2.4{t_1} = 4 \Rightarrow {t_1} = \frac{1}{2}\) \(\therefore \) length of focal chord \( = a{\left( {t + \frac{1}{t}} \right)^2}\) \( = 4{\left( {\frac{1}{2} + 2} \right)^2} = 4.\frac{{25}}{4} = 25\)
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