What is the refractive index of glass for 1 photon?

Refractive index of glass for the VIS light is about 1.5, meaning that light will be reflected with some ratio (say 0.04, if we have normal incidence and semi infinite media). It is obvious for many photons, but how does it look for only 1 photon? How will the ratio of the reflected to incident intensity look like? Will it be 0 or 1? Or is there a flaw somewhere in my reasoning? How does the polarization comes into picture here?

• Thanks for the help. Now to be clear: probability means that one photon reflects while other one will pass, and ration will be 4 to 96 in average. What in the Universe defines the path of the photon? If all photons are same, and material is the same, what chages from event to event? – user142244 Jan 18 '17 at 16:45

• @user142244 .... That's the basic measurement problem. Your calculation of ratios is correct, BTW, for normal incidence on an interface between air and glass with $n=1.5$. – WetSavannaAnimal Jan 20 '17 at 12:33