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Geant4 is a complex and widely-used software toolkit for the simulation ofthe passage of particles through matter and the interactions they undergo. Itcontains very extensive and flexible optical physics capabilities. These allowfor the specification of a lot of properties for materials and surfaces as wellas for the optical physics process itself.  Because of this large variety of possible adjustments, there is a number ofpeculiarities of the optical physics in Geant4, which the user has to be awareof in order to avoid incorrect simulation results due to user mistakes. Asthese peculiarities are not always easy to recognise, this can be a seriousproblem, especially for less experienced users of Geant4.  In order to assist users of optical physics in Geant4 in avoiding mistakes,this paper gives a summary of peculiarities of the optical physics in Geant4.

Peculiarities in the Simulation of Optical Physics with Geant4