Actually I am trying to model light propagation within biological tissues like apple tissue. I am using the Helmholtz equation in PDE module. But I come across problems in boundary conditions settings.
I have a same question, but I think you have to use Wave Optics modules and the key answer is that we have to find Pointing Vector for studying the parameters such as light scattering, light intensity , because as I checked we can only see Electric or Magnetic Norms . ...