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Normal Unit Vector . The unit normal is orthogonal (or normal, or perpendicular) to the unit tangent vector and hence to the curve as well. Unit vector has a magnitude of 1. Learn how to find the vector that is perpendicular, or normal, to a surface. Given a vector v in the space, there are infinitely many perpendicular vectors. We've already seen normal vectors when we were dealing with equations of planes. You will need this skill for computing flux in three dimensions. Normal vector to a parametric surface. Leave empty, if you don't need the unit normal vector at a specific point. A normal vector is a perpendicular vector. The principal unit normal vector. Determining the unit tangent vector. There are actually two normal vectors, the one we show and another in the opposite direction (not shown). In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) of length 1. Unit normal vector of a surface. A unit vector is often deno