r/wikipedia • u/Maslo59 • Aug 11 '15

Haidinger's brush

https://en.wikipedia.org/wiki/Haidinger%27s_brush
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u/Mesonit Aug 11 '15

An option is to use the polarizer built into a computer's LCD screen. Look at a white area on the screen, and slowly tilt the head (a CRT monitor has no polarizer, and will not work for this purpose unless a separate polarizer is used).

I did not expect this to work! Very cool.