Hi, I'd love a to have a more graphical understanding of how a plane wave interacts with a boundary. I know the maths that describes it, Fresnel's equations etc, and how Brewster's angle is derived and stuff. I'm rather confused with the dipole concept. From what I understand, when a plane normal to the boundary hits the boundary, charge gathers on the boundary and reflects it. If the material is a dielectric though, the material will also reflect it, but with a phase delay (I imagine this to be because the dipole needs to absorb it and then re-radiate it). My issue comes when trying to understand what happens at an angle. I believe that at an angle, it'll basically be a combination of what I've described, as well as what happens when the electric field polarisation is parallel to the boundary (the polarisation is perpendicular to the plane of incidence). I don't 'get' what goes on here, what does the boundary 'do', what causes the reflection? And at Brewster's angle, the dipoles supposedly become oriented in such a way that they do not radiate perpendicular and hence nothing is reflected... How does the incoming wave affect the orientation of the dipoles? Is there a picture or animation that can show me the dipoles rotating? I understand that the understanding I'm seeking may seem trivial because *really* this stuff doesn't work like this, and it's simple a limited (flawed) model; however, it would greatly help my understanding and I'd appreciate some help with this! I'm not really interested in a bunch of equations like most books seem to present. Thank you.