R = 2f
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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.
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 radius of curvature and the focal length mean the same so the radius of curvature is also 15 cm.
The radius is half the diameter.