Using your polarized sunglasses as an polaroid analyzer, you can easily see that a rainbow is polarized. Scattered electromagnetic radiation is polarized. Using a lens from your sunglasses can reveal a wealth of information about a property of light. Next time you see a rainbow and you happen to have your polarized sunglasses with you, look through one lens at the rainbow and rotate it 90 degrees and you will see the rainbow "disappear"!
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