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Almost every version of trapping lightrays with mirrors is either resolved---usually negatively---or open:

However, there are variations in the reflection laws that might change matters:

My question is:

Q. Can one "construct a polygonal trap for a parallel beam of light" (to quote Tabachnikov) under a natural different model of reflection and/or paths under gravity?

I think for billiards under gravity the answer is likely Yes, but I have little intuition for reflections at a fraction of angle of incidence.



     RayDisksReturn
      Trapping a ray between two disks.
      
       Paths under gravity.


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    $\begingroup$ I don't understand "Almost every version of trapping lightrays with mirrors is either resolved or open." What other alternative is there? $\endgroup$ Aug 15, 2019 at 7:05

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