Electrical, Computer & Energy Engineering | University of ...

: This is loosely based on Christiaan Huygen’s method of propagating wavefronts he developed in 1678. Whereas Huygen proposed that each point on a wavefront was the source of spherical waves (with Lambertian directional fall off), Zemax uses the assumption that each ray traced to the image plane represents a plane wave with the ray’s path length at the point where the ray hits the image ... ................
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