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That's essentially what we learned the last couple of videos. So that angle right there is going to be the same as that angle right there. We saw that before, and those angles are measured relative to a perpendicular. And if the surface is smooth, the incident angle is going to be the same thing as the reflected angle. And that's just the idea of the light rays bouncing off of a surface. In the last couple of videos we talked about reflection. This also explains how the beam of light DOESN'T BEND when you shine the beam along the normal the two sets of photons hit the surface at exactly the same time, so the light doesn't bend it just becomes slower. If the beam didn't bend, the beam wouldn't even be a beam, as the two lines of photons wouldn't be in the same line. Since the photons in the beginning of the other side of the beam don't hit the surface at the same time, there's a kind of a lag, and the beam bends. When you shine the beam of light on the surface that separates the two media, the photons in the beginning of one side of the beam hit the surface first, right? So they're the first set of photons to become slower (entering denser medium). The photons keep bumping into all sorts of particles in the medium. It doesn't have that much space to travel freely. The beam of light is slower in a denser medium because it's movement is hindered by lots of particles (in the media), compared to a rarer medium. Alright, let's take a beam of light, travelling from an optically rarer medium to an optically denser medium, say air and glass respectively.