Your computer screen produces linearly polarized light. When polarized light shines through a plastic object, it shows a pattern of stress within the plastic from when it was stamped in manufacturing. If you place a polarizing filter on your camera to dim the background light, the patterns change color. This is some cheapo plastic dinnerware sitting on my laptop screen, with a circular polarizer on the camera turned enough to make the background dark.
by Joe Zink November. 24, 2018 753 views
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