Illuminance and caustic surfaces in multi-interface variable-index media. 3: Source imbedded in variable-index medium, light reflected or refracted by multiple surfaces.
All terms required to calculate the illuminance and caustic points along a ray path are evaluated for a source imbedded in a z-dependent variable-index medium. The ray path may undergo reflections or refractions from multiple surfaces imbedded in the medium. The procedure is general and applies to multiple surfaces and multiple media and is valid for all rays.
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Burkhard