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Polarized sunglasses allow you to see the orientation of light. That combined with birefringence can help you see patterns of stress inside materials. But how does that work exactly?
Correction Video about Safety Hammers:
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PhysicsGirl on Birefringence and Polarization:
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CHAPTER TIME CODES
00:00 Cold Open
00:39 Polarization Explained
03:24 Birefringence Explained
04:18 Pattern Examples
05:18 Types of Glass
06:17 Breaking Glass
07:34 Summary
08:00 Sponsor Message
09:08 Outro
09:33 Featured Comment
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Corrections:
5:43 Just to clarify: Side windows and rear windshields of automobiles are tempered. Front windshields are annealed, specifically two pieces of annealed glass with plastic between them to hold it together.
