2020-06-25
[public] 219K views, 19.5K likes, 54.0 dislikes audio only
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This is a phenomenon of polarised light. Two filters lining the tube are at right angles to each other. There is *not* a clear disk in the middle!
Here's the reddit post I mentioned in the video (bad language warning!):
https://stevemould.com/redditbmfs
(I've hidden the URL behind a redirect because it contains a cuss word and I'm scared of the algorithm!)
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