# Glass as seen through polarized sunglasses

**URL:** <https://boards.straightdope.com/t/glass-as-seen-through-polarized-sunglasses/7599>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [September 9, 1999, 10:48pm UTC](https://boards.straightdope.com/t/glass-as-seen-through-polarized-sunglasses/7599 "1999-09-09T22:48:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dougie\_monty](https://avatars.discourse-cdn.com/v4/letter/d/439d5e/32.png) [@dougie\_monty](https://boards.straightdope.com/u/dougie_monty)\
**Post date:** [September 9, 1999, 10:48pm UTC](https://boards.straightdope.com/t/glass-as-seen-through-polarized-sunglasses/7599/1 "1999-09-09T22:48:00Z")

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Why does car window glass have spots on it when you look at it through polarized lenses?

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**Author:** ![Chef\_Troy](https://avatars.discourse-cdn.com/v4/letter/c/85f322/32.png) [@Chef\_Troy](https://boards.straightdope.com/u/Chef_Troy)\
**Post date:** [September 10, 1999, 12:56pm UTC](https://boards.straightdope.com/t/glass-as-seen-through-polarized-sunglasses/7599/2 "1999-09-10T12:56:00Z")

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I’ve noticed that too. I always assumed it was one of the properties of safety glass, which is a sandwich of two layers of glass with plastic in the middle.

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