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

माना समतल \(\overrightarrow{ r } \cdot(2 \hat{ i }-\hat{ j }+\hat{ k })- b =0\) के सापेक्ष बिन्दु \((1,3, a )\) का दर्पण प्रतिबिम्ब \((-3,5,2)\) है। तो \(| a + b |\) का मान बराबर है

  1. A \(0\)
  2. B \(1\)
  3. C \(2\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(1\)

Step-by-step Solution

Detailed explanation

plane \(=2 x-y+z=b\) \(R \equiv\left(-1,4, \frac{a+2}{2}\right) \rightarrow\) on plane \(\therefore-2-4+\frac{a+2}{2}=b\) \(\Rightarrow a+2=2 b+12 \Rightarrow a=2 b+10 \ldots(i)\) \( < P Q > = < 4,-2, a-2 > \) \(\therefore \frac{2}{4}=\frac{-1}{-2}=\frac{1}{a-2}\)…
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