Petzval curvature

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Petzval curvature [′pets·väl ′kər·və·chər]

(optics)

The axial curvature of the image of a plane object produced by an optical system, equal to the sum over all the optical surfaces in the system ofR(1/n′- 1/n), whereRis the curvature of the surface, andnandn′are the refractive indices before and after the surface. Also known as Petzval sum.

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