Question

what is average radius of curvature? ​

Answer 1

Answer:

In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.

Answer 2

Answer:

sister correct answer is focal length