I was talking to a colleague about optical scattering from a metallic nanoparticle, and we had a very simple doubt. If you have a particle that's small compared to the illuminated area, you can use Mie theory to calculate the scattering you'll get. However, if the particle is very big, you have a mirrored ball and light will be reflected from it. We don't call that scattering.
Do we call the phenomenon "reflection" when we have "scattering" from a surface that's bigger than the illuminated area?
Or maybe it has to do with the polar intensity diagram: if the scattered distribution is narrow we call it reflection. However, the term "diffuse reflection" contradicts this idea.
NOTE: I understand that all these cases are just the solution to Maxwell's equations, and that we assign different names for different kinds of solutions. But my question is about how we name this processes.