Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The direction cosines 
, m and n of two lines are connected by the relations 
+ m + n = 0 and 
m=0, then the angle between the lines is
A
B
C
D
0
Text Solution
Verified by ExpertsThe correct answer is:
A
Given, 
+ m + n = 0 ...(i)
and 
m = 0
i.e. either m = 0 or 
= 0
If 
= 0, then putting in equation (i), we get m = - n
Direction ratios are 0, - n, n i.e. 0, -1,1
If m = 0 , then putting in equation (i), we get 
= -n
Direction ratios are - n, 0, n i.e. -1,0,1
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