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

बिन्दुओं \((0,-1,0)\) तथा \((0,0,1)\) से होकर जाने वाले तथा समतल \(y - z +5=0\) के साथ \(\frac{\pi}{4}\) का कोण बनाने वाले समतल के अभिलम्ब के दिक अनुपात (direction ratios) है

  1. A \(2, -1, 1\)
  2. B \(2, \sqrt 2, - \sqrt 2\)
  3. C \(\sqrt 2, 1, - 1\)
  4. D Both \((B)\) and \((C)\)
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Correct Answer

(D) Both \((B)\) and \((C)\)

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Detailed explanation

d. \(\mathrm{r},\) of \(\mathrm{AB}\) \(=(0,1,1)\) \(a \cdot 0+b \cdot 1+c \cdot 1=0\) \(b+c=0\) \(b+c=0\) ......\((i)\) \(\cos \frac{\pi}{4}=\frac{a \cdot 0+b(1)+c(-1)}{\sqrt{a^{2}+b^{2}+c^{2}} \cdot \sqrt{2}}\)…
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