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You could also buy a circular polarising filter for a camera for $5 that would do the trick: https://www.bhphotovideo.com/c/product/972392-REG/bower_fp67cc_67mm

• barking 9y ago
  that's a good idea
  • tk75x 9y ago
    Or go see a 3D movie and take the glasses home with you. The lenses are polarized 90 degrees in relation to each other. Pop the plastic lenses out and experiment by overlaying the two pieces then rotating one while keeping the other still.