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Two lines (x-x(i))/(l(i))=(y-y(i))/(m(i)...

Two lines `(x-x_(i))/(l_(i))=(y-y_(i))/(m_(i))=(z-z_(i))/(n_(i)), (i=1,2)` are perpendicular to each other, if their direction ratios satisfy

A

`(l_(1))/(l_(2))=(m_(1))/(m_(2))=(n_(1))/(n_(2))`

B

`l_(i)=m_(i)=n_(i)`

C

`l_(1)l_(2)+m_(1)m_(2)+n_(1)n_(2)=-1`

D

`l_(1)l_(2)+m_(1)m_(2)+n_(1)n_(2)=0`

Text Solution

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The correct Answer is:
D
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