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Q: How does reflection work?
The original question was: How does reflection work (what happens on the reflective surface), why is the angle of incidence equal to the angle of reflection and can this be viewed both from particle and wave point of view? Physicist: In a way, reflection can’t really be described as particle phenomena at all. Essentially, a reflective surface enforces some kind of restriction on the wave, usually that the wave must have zero amplitude at the surface. So, the boundary condition is satisfied: the wave has zero value at the surface (whether that’s zero air movement, or whatever). That gives you exactly what you need for the angle of incidence and the angle of reflection to be equal.
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