If the lines 
and 
are perpendicular to each other then find the value of λ.
Given – 
& 
To find – The value of λ
Direction ratios of L1 = (-3,2λ,2)
Direction ratios of L2 = (3λ,1,-5)
Tip – If (a,b,c) be the direction ratios of the first line and (a’,b’,c’) be that of the second, then the angle between these pair of lines is given by 
Since the lines are perpendicular to each other,
The angle between the lines
1