Why can you not see through fog when it’s ahead of you but you can once you’re in it?
In: Physics
You could get the same idea with panes of tinted glass.
Put a piece of tinted glass (hypothetically) a foot from your face. Then another a foot behind it, then another and another. Say you’ve now got 10 panes of glass a foot apart and you looking through all of them at a flashlight at the other end. Even if they’re all quite lightly tinted, by the time the light gets through all of them to your eyes it might be extremely faint or not visible at all.
Now move your head in 5 panes. The light is brighter. It didn’t get brighter, there are just less panes between you and the light.
Same with fog. It’s blocking light at a certain “percent” like the tint and the more of it you’re looking through the less light you’re seeing.
So like when you moved up 5 panes and got closer to the light. You could see it better. Imagine instead of moving up you just put the 5 panes behind the flashlight. That’s fog. There is still 10 panes, but now there is only 5 between you and what you’re seeing. You can’t see anything beyond 10 panes, but anything that moves within 5 panes of your eye becomes visible.
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