April 12, 2006

Polarizers, car windows and mysterious checkerboard patterns

I have polarized sunglasses, which I love. One thing that’s always puzzled me while wearing them is that some car windows show a very strong checkerboarn pattern that’s only visible with a polarizer.

Stress? Pressure points from however they bend the glass during casting or molding? I’ve debated this several times with physicist friends to no avail.

Today I have an answer.

One more thing to understand!


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