A) \[c>0\]
B) \[c=\pm \sqrt{3}\]
C) \[0<c<1\]
D) \[c>2\]
Correct Answer: B
Solution :
Since direction cosines of line are \[\left( \frac{1}{c},\frac{1}{c},\frac{1}{c} \right)\] \[\therefore \,\,\frac{1}{{{c}^{2}}}+\frac{1}{{{c}^{2}}}+\frac{1}{{{c}^{2}}}=1\,\,\Rightarrow \,{{c}^{2}}=3\,\Rightarrow \,\,c=\pm \,\sqrt{3}\].
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