What happens to an electron when a photon is reflected?

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SUMMARY

The discussion centers on the quantum mechanics of photon reflection, specifically addressing how electrons interact with incoming photons. It clarifies that the law of reflection is not a direct quantum effect but rather emerges from the interference of numerous photon wave-packets. The conversation references Richard Feynman's explanatory videos, particularly parts 2 and 3, which cover basic concepts and derive the law of reflection. This highlights the distinction between individual photon behavior and the collective phenomena observed in light reflection.

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  • Quantum mechanics fundamentals
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  • Feynman's lectures on quantum electrodynamics
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I understand that reflection of light involves absorption of the incoming photons and emission of new photons. But what happens on a quantum level that enables an electron to emit a photon at an angle of reflection that is equal to the absorbed photon's angle of incidence? If the incoming photon were to bounce off the electron, then everything makes sense. But, if I understand reflection correctly, the incoming photon is absorbed and a new photon is emitted. What is happening?
 
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But what happens on a quantum level that enables an electron to emit a photon at an angle of reflection that is equal to the absorbed photon's angle of incidence?
It doesn't. The law of reflection is the result of interference of a large number of photon wave-packets ... it is not a quantum-mechanical effect. It only happens on average.

Feynman got quite good at explaining it


... 2&3/7 - worth seeing them all.
part 2 covers the basic concepts, part 3 derives the law of reflection
 
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The videos are perfect - thanks!
 

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