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

बिंदुओं \(\mathrm{P}(1,2,1)\) और \(\mathrm{Q}(2,1,-1)\) से होकर गुजरने वाली एक रेखा \(\mathrm{L}\) पर विचार कीजिए। यदि बिंदु \(\mathrm{A}(2,2,2)\) का रेखा \(\mathrm{L}\) में दर्पण प्रतिबिंब \((\alpha, \beta, \gamma)\) है, तो \(\alpha+\beta+6 \gamma\) = ...........

  1. A \(6\)
  2. B \(7\)
  3. C \(3\)
  4. D \(12\)
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Answer & Solution

Correct Answer

(A) \(6\)

Step-by-step Solution

Detailed explanation

\(DR'\)s of Line \(L \equiv-1: 1: 2\) \(DR'\) s of \(A B \equiv \alpha-2: \beta-2: \gamma-2\) \(\mathrm{AB} \perp_{\mathrm{ar}} \mathrm{L} \Rightarrow 2-\alpha+\beta-2+2 \gamma-4=0\) \(2 \gamma+\beta-\alpha=4\) Let \(C\) is mid-point of \(A B\)…
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