|Message: Re: snell law between water and air||Not Logged In (login)|
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> You quoted: "We also don't know how exactly you've defined the water/air surface (smooth, rough etc. etc.)" > I may misunderstood the User's guide for application Developers: "For the simple case of a perfectly smooth interface between two dielectric materials, all the user needs to provide are the refractive indices of the two materials stored in their respective G4MaterialPropertiesTable. " > So all what i did to make sure the snell law is respected in my code is providing the refractive indices of the water and air.
OK, that's correct. It is true, for a perfectly smooth surface that's all you need to do!
> However in my detector construction I included now > G4OpticalSurface* WaterSurface = new G4OpticalSurface("WaterSurface"); > WaterSurface->SetType(dielectric_dielectric); > WaterSurface->SetFinish(ground); > WaterSurface->SetModel(unified); > new G4LogicalBorderSurface("WaterSurface", > target,world,WaterSurface); > > is this correct?
Yes, but now you got a rough surface and that makes things more complicated to understand because we are now dealing with facet-surface-normals.
> but i thought simple matter like > light travel from water to air is already verified in geant4.
Rest assured, it certainly is!
> Obviously i have to verify my code
Also, make sure your photon source has random photon polarization. My guess is that the result you are seeing is a consequence of the tallying code.
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