There is quite foggy day today here, I cannot see end of the street. This made me think about how much worse can it be.
So here is my question: how thick a fog can be? What's the smallest visibility distance possible?
By visibility distance I mean how far I can see a black object against a white background in the fog.
There were some nitpicks, so let me clarify a bit:
- I think of water/ice fog.
- It's said that angular size matters, so let's say an object whose angular size as big as the full moon.
- Whiteout doesn't count, assume the soil remains dark.