If you want proof, there is a thing called photomultiplier. A photomultiplier counts photons. You can’t count waves, but you can count particles. What concerns us about light is how it behaves, because physicists always like to know why things happen, and to figure this out, they need to know how things happen. Some daily-life examples from light’s behavior is a good place to start observing light. We know that light gets reflected from a mirror with the same angle
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