here's one to check out

adapt Blue Herrin's code like,

#declare reflector =
box {
  <-0.5, -4, -4>, <0, 4, 4>
  hollow
  pigment { rgbft <0,1,0,.1,.9> } //White }
  finish {
    reflection { 1 }
  }
  photons {
    target
    reflection on
    refraction on
  }
  rotate z * 45
  translate x * -9
}
object { reflector }


in place of current reflector, I dont know why I am see what I am seeing.
3 beams reflected and transmitted? well I really cant see it yet, very slow.

render center region with drag, low low res

next logical step experiment with prism shape , perhaps other shapes

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