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If the direction cosines of two lines are given by $l + m + n = 0 a n d \frac{1}{l} - \frac{2}{m} + \frac{1}{n} = 0$ , then the angle between them is

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detailed solution

Correct option is C

The standard concept: a=b=c=1 and f=h=1 , g=−2⇒fa+gb+hc=11−21+11=0Therefore, both lines intersect at right angle.

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If the direction cosines of two lines are given by l+m+n=0 and 1l−2m+1n=0 , then the angle between them is

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If the direction cosines of two lines are given by $l + m + n = 0 a n d \frac{1}{l} - \frac{2}{m} + \frac{1}{n} = 0$ , then the angle between them is