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

यदि बिंदु \(P(3,4,9)\) का रेखा \(\frac{x-1}{3}=\frac{y+1}{2}=\frac{z-2}{1}\) में दर्पण प्रतिबिंब \((\alpha, \beta, \gamma)\) है, तो \(14(\alpha+\beta+\gamma)\) = ...........

  1. A \(102\)
  2. B \(138\)
  3. C \(108\)
  4. D \(132\)
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Answer & Solution

Correct Answer

(C) \(108\)

Step-by-step Solution

Detailed explanation

\( \overrightarrow{\text { PN. }} \cdot \vec{b}=0 ? \) \( 3(3 \lambda-2)+2(2 \lambda-5)+(\lambda-7)=0 \) \(14 \lambda=23 \Rightarrow \lambda=\frac{23}{14} \) \( \mathrm{~N}\left(\frac{83}{14}, \frac{32}{14}, \frac{51}{14}\right) \)…
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