Normal (geometry)

A polygon has two normal vectors.

For a surface, the normal at a given point is the same as that of the plane touching the surface at that point.

In geometry, an object (such as a line) is called normal, if it is at a right angle to another object.

Normal (geometry) Media

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  Tangent and normal to a curve in a Cartesian coordinate system.

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  Normal direction (in red) to a curve (in black).

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  Plane equation in normal form

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  A curved surface showing the unit normal vectors (blue arrows) to the surface

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  A vector field of normals to a surface

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  Diagram of specular reflection