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.
One more thing to understand!