This might be a possible duplicate( I couldn't find a similar question though). While travelling through trains/cars, we often pass through non-luminous patches,as in tunnels or even at night. What I noticed, was that in such cases, the glass tends to act more like a mirror. I can partially see outside, and partly see my own reflection.
To generalise this observation: A transmitting medium like glass or plastic sheets, tend to behave like mirrors, whenever there is an imbalance in illumination on its opposing transmission surfaces, the light being reflected on whichever side there is a higher illumination. Is this statement correct by and large? And what could be the reason to it? Thanks!
