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JEE Mains · Maths · STD 12 - 11. three dimension geometry

यदि बिंदु \(P(1,-2,3)\) का समतल \(2 x+3 y-4 z+22=0\) में वह प्रतिबिंब जो रेखा \(\frac{x}{1}=\frac{y}{4}=\frac{z}{5}\) के समांतर है, \(Q\) है, तो \(PQ\) बराबर है:

  1. A \(6\sqrt 5 \)
  2. B \(3\sqrt 5 \)
  3. C \(2\sqrt {42} \)
  4. D \(\sqrt {42} \)
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Answer & Solution

Correct Answer

(C) \(2\sqrt {42} \)

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Detailed explanation

\(\text { Equation of line } \mathrm{PQ} \text { is } \frac{x-1}{1}=\frac{y+2}{4}=\frac{z-3}{5}\) \(\text { Let } \mathrm{F} \text { be }(\lambda+1,4 \lambda-2,5 \lambda+3)\) Since Flies on the plane \(\therefore 2(\lambda+1)+3(4 \lambda-2)-4(5 \lambda+3)+22=0\)…
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