Q: How does the reflectivity of a light-source change when it is switched on/off?
Consider a light-source like an red LED with some white light shining on it. When the LED's switched off, it's going to be absorbing some of the white light (I'm fairly certain of this) and it won't appear reflective. But when the LED is switched on, does it reflect any of the white light? Furthermore, would the electrons in the LED that emit red light start reflecting red wavelengths from the white light?
I was asked this question earlier today and dismissed it as silly but after reading up on it for a while, I realised I couldn't give a good answer. This is my first time posting on this stackexchange so thanks for letting me ask this question.