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If (l,m,n) are direction cosines of a li...

If (l,m,n) are direction cosines of a line then `L^(2)+m^(2)+n^(2)`

Answer

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Knowledge Check

  • If l , m, n are the direction consines of a line, then

    A
    `l+m+n=0`
    B
    `l+m+n=1`
    C
    `l^(2)+m^(2)+n^(2)=1`
    D
    `l^(2)+m^(2)+n^(2)=0`
  • If l, m, n are direction cosines of a line then l hat(i) + m hat(j) + n hat(k) is________

    A
    Null vector
    B
    the unit vector along the line.
    C
    Any vector along the line
    D
    a vector perpendicular to the line
  • If l,m,n are direction cosines of the line then -l,-m,-n can be

    A
    only direction ratios of the line
    B
    only direction cosines of the line
    C
    direction cosines and direction ratios of the line
    D
    neither direction cosines nor direction ratios of the line
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