I'm not asking for what reflection and refraction are or the usual law governing it, but I would like to understand what they represent at the quantum atomic, molecular level? In a mirror is it about photons absorbed and emitted with the same wavelength and same direction through atomic electron transitions? How can that be? And what is microscopically refraction? Why should a photon traveling between atoms of a trasparent medium change not only its speed but also its direction? I'm a bit confused... Can someone indicate some nice links explaining all that?