Question

If l,m,n are the direction cosines of the line then magnitude of the line $l\overline{i}+m\overline{j}+n\overline{k}$ is

Answer 1

If l, m, n are the direction cosines of the line $l\hat{i}+m\hat{j}+n\hat{k}$, then the magnitude of the line is 1 unit.

Because, $\sqrt{l^2+m^2+n^2}=1$