Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Let the foot of perpendicular from a point P(1, 2,−1) to the straight line 
be N. Let a line be drawn from P parallel to the plane x + y + 2z = 0 which meets L at point Q. If is the acute angle between the lines PN and PQ, then cos α is equal to
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
⇒ N(1, 0,−1)
Now,
⇒ μ = −1
⇒ Q(−1, 0, 1)
and 
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