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Forum: Processes Involving Optical Photons
Re: Question snell law between water and air (Yusuf)
Re: Feedback Re: snell law between water and air (Gumplinger Peter)
Re: Question Re: snell law between water and air (Yusuf)
Date: 05 Jan, 2013
From: Gumplinger Peter <Gumplinger Peter>

> 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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1 None: Re: snell law between water and air   (Yusuf - 06 Jan, 2013)
(_ Feedback: Re: snell law between water and air   (Gumplinger Peter - 06 Jan, 2013)
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