@temptoetiam@octodon.social @_thegeoff

On shallow enough angles you get more reflection (and maybe even more reflection than scattering). This gets exploited by https://en.wikipedia.org/wiki/Wolter_telescope

I actually realised now that I don't understand why the angles need to be shallower for gamma (Fresnel equations imply that reflectivity for a given direction and polarisation of beam depends only on refractive index -- with no reflection at all for equal refractive indices -- and in the around-visible range refractive indices tend to grow with decreasing wavelength).