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File:3D Ionospheric Ray Example.png - Wikipedia

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Ray transfer matrix analysis: Matrix, Ray Tracing, Optics, Laser, Vector Space, Paraxial Approximation, Electrical Network, Two-Port Network : Surhone, Lambert M., Tennoe, Mariam T., Henssonow, Susan F.: : Libri

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File:Ray trace diagram.png - Wikipedia

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Raytracing Workbench - FreeCAD Documentation

Visual representation of Ray tracing