Q119 / 200 · Manipal (MET) 2010 · Mathematics

The direction cosines of any normal to the $x y$-plane are

  • A
    $1,0,0$
  • B
    $0,1,0$
  • C
    $1,1,0$
  • Correct answer
    D
    $0,0,1$

Solution

The equation of $x y$-plane is $z=0$ $\therefore$ Direction cosines of its normal are $0,0,1$.

Hence, the correct answer is option: 'D'.

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