This starts with the collocation circle to go through the three points on the curve. First write the equation of a circle. Then write three equations that force the collocation circle to go through the three points on the curve. Last, solve the equations for a, b, and r.
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There is a specific formula for finding the radius of a curvature, used often when one is measuring a mirror. The formula is: Radius of curvature = R =2*focal length.
The focal length of a concave mirror is about equal to half of its radius of curvature.
The Center of curvature is 2 times the focal length. By the way this is a physics question.
go to physicsclassroom.com. its wonderfully explained with animated diagrams.
10 cm from the mirror.