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Name: Miguel
Status: Student
Grade: Other
Location: NY
Country: United States
Date: April 2007

How are polarized filters made?

Hi Miguel,

Although I am familiar with the general principles of polarized filters (specifically the sheet polarizers known by the registered trade name of "Polaroid), I was not aware of the basic manufacturing methods of the various types of these materials. For a lot more detail that I can tell you, have a look here...

The general principle is that a layer of long narrow crystals are laid down on a thin sheet of clear plastic, then the plastic sheet is stretched or otherwise stressed in one direction to align the crystals all in a single direction.


Bob Wilson.

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