Theory
Surface gloss is considered to be the amount of incident light that is reflected at the specular reflectance angle of the mean of that surface. So, specular gloss is proportional to the reflectance of the surface.
The Fresnel formula gives the specular reflectance, for an unpolarized light of intensity, at angle of incidence, giving the intensity of specularly reflected beam of intensity, while the refractive index of the surface specimen is .
The Fresnel equation is given as follows :
Read more about this topic: Gloss (material Appearance)
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