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Purpose:An example of a birefringent material occuring in nature.
Procedure:Place a piece of paper with a small hole in the middle on the overhead projector and place the calcite crystal holder over the hole. Two holes will now be visible on the screen, one caused by the ordinary ray and one by the extraordinary ray. A polariod can be placed in the path and rotated to show that the rays are polarized in mutually perpendicular directions.
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