Normal Vector
Introduction
The normal vector, often simply called the "normal", to a surface is a vector perpendicular to it. Often, the normal unit vector is desired, which is sometimes known as the "unit normal".
The normal vector at point (x0, y0) on a surface z = f(x ,y) is given by
where 
and 
are partial derivatives.
A normal vector to a plane is specified by
is given by
where 
denotes the gradient.
References & Resources
- http://mathworld.wolfram.com/NormalVector.html
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