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The equation of line passing through $(1, 5, 3)$ and having direction ratios $⟨ l, m, \frac{1}{2} ⟩$ in symmetric form is $\frac{x - 1}{l} = \frac{y - 5}{m} = \frac{z - 3}{\frac{1}{2}}$ then $l^{2} + m^{2} =$

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Correct option is C

If ⟨l,m,n⟩ are direction cosines of a line then l2+m2+n2=1Hence, l2+m2+(12)2=1⇒l2+m2=1−14=34

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The equation of line passing through (1,5,3) and having direction ratios ⟨l,m,12⟩ in symmetric form is x−1l=y−5m=z−312 then l2+m2=

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The equation of line passing through $(1, 5, 3)$ and having direction ratios $⟨ l, m, \frac{1}{2} ⟩$ in symmetric form is $\frac{x - 1}{l} = \frac{y - 5}{m} = \frac{z - 3}{\frac{1}{2}}$ then $l^{2} + m^{2} =$