curvature of a surface(redirected from reciprocal metre)
curvature of a surface
A measure of the shape of a curved surface. It is expressed in a unit called reciprocal metre, usually written as m−1, which is equal to the reciprocal of the radius of curvature of a surface in metres. Example: if a surface has a radius of curvature r of +0.5 m, its curvature R will be R = 1/r = 1/+0.5 = 2 m−1.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann