If the direction cosines of a line are k,k,k, then
A
k=1
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B
k>0
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C
k=1√3or−1√3
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D
0<k<1
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Solution
The correct option is Ck=1√3or−1√3 Using the relation between direction cosines l2+m2+n2
here , l=m=n=k ⇒k2+k2+k2 ⇒3k2=1 ⇒k2=13 ⇒k=±1√3
Hence , option(D) is correct