Also the Fresnel reflection coefficient comes into play [0]: water surface has higher reflectivity at grazing-incidence angles than at those close to the surfac

Also the Fresnel reflection coefficient comes into play [0]: water surface has higher reflectivity at grazing-incidence angles than at those close to the surface normal. [0] https://en.wikipedia.org/wiki/Fresnel_equations https://en.wikipedia.org/wiki/Fresnel_equations