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CGP EDU Academic Team
Published on: August 14, 2026
The direction cosines of a line satisfy the relation λ ( λ + m)
= n, mn + n λ + λ m = 0.
The value of λ , for which the two lines are perpendicular to each other is-
Text Solution
Verified by ExpertsThe correct answer is:
B
For λ = –m + 
, the second relation gives
mn + n 
= 0
or n2 + mn – λ m2 = 0 ⇒ 
– λ = 0.
If 
, 
are its roots then 
= – λ
⇒ 
Since the lines are perpendicular –1 –1 + λ = 0
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