Today, one of my friends, he take out the polarizer from hand calculator.
when he put the polarizer horizontally, in front of laptop screen, it transparent, when rotate 90 degree, it becomes dark. trivial.
however, when we flip the polarizer, things inverse. it becomes dark when putting horizontally, and transparent when vertical!!
anyone can explain that??? hint: the light come out from the screen is polarized in some direction.
information about polarizer: http://en.wikipedia.org/wiki/Polarizer
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