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A line has direction cosines l = 1/2 and m = 1/2. A possible value of n is:
A1/2
B1/sqrt(2)
C1/4
Dsqrt(3)/2
Answer & Solution
Correct answer: B. 1/sqrt(2)
Since l^2+m^2+n^2=1, n^2 = 1 - 1/4 - 1/4 = 1/2, so n = 1/sqrt(2) in magnitude.
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