If a, b, c are the direction ratios of the line and l, m, n are the di – 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 true?
A.	( frac{l}{a}= frac{m}{b}= frac{n}{c}= )
B.	( frac{l}{a}= frac{m}{b}= frac{n}{c}= -1 )
C.	( frac{l}{a}= frac{m}{c}= frac{n}{b}= )
D.	( frac{l}{a}= frac{n+1}{b}= frac{n}{c}= )
Answer» B. ( frac{l}{a}= frac{m}{b}= frac{n}{c}= -1 )

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