If a, b, c are the direction ratios of the line and l, m, n are the d – McqOptions

MCQOPTIONS

1.	If a, b, c are the direction ratios of the line and l, m, n are the direction cosines of the line, then which of the following is incorrect?
A.	\(\frac{l}{a}=\frac{m}{b}=\frac{n}{c}=k\)
B.	l2+m2+n2=1
C.	k=&pm;\(\frac{1}{\sqrt{(a^2+b^2+c^2)}}\)
D.	l2-m2=n2-1
Answer» E.

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