what is mean by radius of curvature
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Radius of curvature (ROC) has specific meaning and sign convention in optical design. A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis. ... The distance from the vertex to the center of curvature is the radius of curvature of the surface.
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the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.
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