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

माना समतल \(2 x - y + z +3=0\) के सापेक्ष बिन्दु \(Q (1,3,4)\) का दर्पण प्रतिबिंब \(S\) है तथा माना इस समतल पर एक बिन्दु \(R (3,5, \gamma)\) है। तो रेखा खण्ड \(SR\) की लंबाई का वर्ग है ........... |

  1. A \(72\)
  2. B \(27\)
  3. C \(36\)
  4. D \(6\)
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Answer & Solution

Correct Answer

(A) \(72\)

Step-by-step Solution

Detailed explanation

Since \(\mathrm{R}\,(3,5, \gamma)\) lies on the plane \(2 \mathrm{x}-\mathrm{y}+\mathrm{z}+3=0\). Therefore, \(6-5+\gamma+3=0\) \(\Rightarrow \gamma=-4\) Now, dr's of line \(QS\) are \(2,-1,1\) equation of line \(Q S\) is…
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