Geometric Optics Imaging through medium

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Very new to COMSOL geometric optics, trying to model how an image looks after a cross grating / scattering medium / absorption layer domain or boundary. At first I want to keep it as simple as possible and looking for insight to support my challenges. All of my Multiphysics experience thus far has been in wave optics module.

To keep it as simple as possible for now the optical train would be image plane -> medium -> lens -> ray detector. I was able to compute ray trajectories previously, but some troubleshooting change i made to the physics broke things and now am getting an error each run time that prevents ray trajectories from being plotted. Advice / insight / applicable models to point to and learn from are all helpful. I already tried adapting the double gaussian lens for my purpose by adding an additional film domain right in front of the image plane but that seemed to have broken things.

Objective: Input scattering medium or cross grating parameters to model image formation through the medium. Idealistically similar to the double gauss lens tutorial results where the image and formation are next to each other.



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