WBJEE · Maths · Three Dimensional Geometry
The angle between a normal to the plane \(2 x-y+2 z-1=0\) and the X-axis is
- A \(\cos ^{-1} \frac{2}{3}\)
- B \(\cos ^{-1} \frac{1}{5}\)
- C \(\cos ^{-1} \frac{3}{4}\)
- D \(\cos ^{-1} \frac{1}{3}\)
Answer & Solution
Correct Answer
(A) \(\cos ^{-1} \frac{2}{3}\)
Step-by-step Solution
Detailed explanation
Hint: Normal : 2, -1, 2 \(\text {X-axis : } 1,0,0\) \(\therefore \theta=\cos ^{-1} \frac{2}{3}\)
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