If l, m, n are the direction cosines of ...

If `l`, m, n are the direction cosines of a line, then: a) `l^(2)+m^(2)+n^(2)=1` b) `l^(2)+m^(2)+n^(2)=0` c) `l+m+n=1` d) `l+m+n=0`

`l^(2)+m^(2)+n^(2)=1`

`l^(2)+m^(2)+n^(2)=0`

`l+m+n=1`

`l+m+n=0`

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The correct Answer is:

If l, m, n are direction cosines of a line then l hat(i) + m hat(j) + n hat(k) is

null vector

the unit vector along the line

any vector along the line

a vector perpendicular to the line

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If `l`, m, n are the direction cosines of a line, then: a) `l^(2)+m^(2)+n^(2)=1` b) `l^(2)+m^(2)+n^(2)=0` c) `l+m+n=1` d) `l+m+n=0`

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If l, m, n are direction cosines of a line then l hat(i) + m hat(j) + n hat(k) is

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