Question

what is the relationship between radius of curvature and focal length?

Answer 1

R=2f
Where R denotes radius of curvature and f denotes focal length
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Answer 2

The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light travelling parallel to the center line, meets the center line (principal axis). The radius of curvature (r) is the radius of the lens that forms a complete sphere.
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