point characteristic function

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point characteristic function [′pȯint ‚kar·ik·tə′ris·tik ‚fəŋk·shən]

(optics)

The integral between two points ofn dsalong some path, wheredsis the arc length of an infinitesimal piece of the path andnis the refractive index; according to Fermat's principle, it is a maximum or minimum with respect to nearby paths for the actual path of a light ray.

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