Published by:
CGP EDU Academic Team
Published on: August 12, 2026
If 
and 
are unit vectors such that 
. 
= λ and 
= 
, then
A
are coplanar if λ = 1
B
Angle between 
and 
is 30° if λ = – 1
and is 30° if λ = – 1
C
angle between 
and 
is 150° if λ = – 1
and is 150° if λ = – 1
D
If λ = 1 then angle between 
and 
is 60°
and is 60°
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a,c)If λ = – 1 then 
, 
and angle between 
, 
is π
∠ between 
and 
= 360° – (90° + 90° + 30°) = 150°
If 
. 
= 1, then following figure is possible then ∠ between 
and 
= 30°
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