Hi, I was hoping someone could provide a good qualitative description of how metals reflect light, preferably with reference. From my understanding, metals reflect low frequency light quite well. I believe the mechanism is that the light oscillates the electron back and forth. Q1. Does the light lose energy as the electron oscillates (it must)? Now that we have a new emitter, the oscillating electron, the light radiated from the electron will combine with the incident light, or at least what's left of it after the energy loss it suffered from helping the electron oscillate. Q2. The reflected light has a pi phase shift if the light was incident on metal from vacuum. Why should this be so? Why should it have a phase at all since the light is being emitted by electrons from all over the surface? Q4. Why does the light attenuate so quickly? The incident light gives its energy to the oscillators, and those oscillators radiate and some energy leaves as reflection and some travels into the material, where it is absorbed and emitted repeatedly? Is this what Joule heating describes or is Joule heating more in regard to the heating of surface electrons due to oscillation? Q5. If Joule heating is found by J.E and the current is high in a metal how can reflectivity also be high? It seems like by conservation of energy when one is high the other should be low. Thank you. If anyone knows of a text I could reference, that would be great. Q3. How does Joule heating happen?