The Disappearing Black Disk

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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Видео The Disappearing Black Disk канала Steve Mould