$ \Rightarrow \hat n\, \bot \,\,\vec u $ અને $\,\hat n\,\, \bot \,\,\vec v \,\,\, $
$\Rightarrow \,\,\hat n\,\,\, = \,\, \pm \,\,\frac{{\vec u \,\, \times \,\vec v \,}}{{|\vec u \,\, \times \,\vec v |}}$
હવે,$\vec u \,\, \times \,\vec v \,\, = \,\,\left( {\hat i\, + \,\hat j} \right)\,\, \times \,\,\left( {\hat i\, - \,\hat j\,} \right)\,\, = \,\, - 2\hat k\,$
$\therefore \,\,\hat n\,\, = \,\, \pm \hat k$
જેથી , $|\,\vec w .\,\,\hat n|\,\, = \,\,|\left( {\hat i\, + \,2\hat j\,\, + 3\hat k\,} \right)\,\,.\,\,\left( { \pm \,\hat k} \right)|\,\, = \,\,3\,$
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