19
votes
2answers
3k views

How are classical optics phenomena explained in QED (Snell's law)?

How is the following classical optics phenomenon explained in quantum electrodynamics? Reflection and Refraction Are they simply due to photons being absorbed and re-emitted? How do we get to ...
22
votes
3answers
1k views

Why does the sky change color?

Why the sky is blue during the day, red during sunrise/set and black during the night?