Question

What is curvature? Definition of curvature only.

Answer 1

The fact of being curved or the degree to which some thing is curved called the curvature

Answer 2

YOUR ANSWER
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$<b>Curvature is the nature of the lense which besides weather the lense is convex or concave ....$

In a general case if we wish to define the curvature at a point , rotate and translate the curve so that the point maps to the origin and the curve is tangent to the x-axis. ..
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•̀.̫•́✧Hope its helps ..•̀.̫•́✧