WEBVTT

1
00:00.000 --> 00:08.000
Compare light transmitted through fog with a clear-path reference, using a defined optical path.

2
00:08.000 --> 00:16.000
In a homogeneous attenuation model, transmission T gives extinction beta: beta = -ln(T) / L.

3
00:16.000 --> 00:24.000
Droplet size changes how water scatters light. Equal liquid-water mass does not guarantee equal transmission.

4
00:24.000 --> 00:32.000
Use matched controls, multiple optical paths and independent days. A single cleared beam does not establish runway visibility.