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![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Mar 2008 23:29:10 IST
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1)r.n^ =d
thts it normal given find the unit vector
then r.n^ =d
2) (r-a). n^ =d
nothing wrong here with that
ur argument is right
it is better to divide it by sqrt of 3 since by formula it is n^ and not just n vector
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