A) \[\pi /2\]
B) \[\pi /3\]
C) \[\pi /4\]
D) \[\pi /6\]
Correct Answer: A
Solution :
By solving two equations, \[({{l}_{1}},\,{{m}_{1}},\,{{n}_{1}})=(2\sqrt{2}-3,\,-\sqrt{2},\,1)\] \[({{l}_{2}},\,{{m}_{2}},\,{{n}_{2}})=(-2\sqrt{2}-3,\,\sqrt{2},\,1)\] \[{{l}_{1}}{{l}_{2}}+{{m}_{1}}{{m}_{2}}+{{n}_{1}}{{n}_{2}}=0\] \ The angle between them is \[\pi /2\].
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