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This webpage from Davidson provides a description of experiments in birefringence using calcite. Photos show the double images produced by calcite crystals, with explanation provided in text and a diagram of sodium nitrate and calcite crystals. A link provides images of a polarization experiment.
Davidson College Dept of Physics. Birefringence. Davidson: Davidson College Dept of Physics, January 2, 2008. http://webphysics.davidson.edu/alumni/milee/jlab/crystallography_www/birefringence.htm (accessed 28 July 2016).
%0 Electronic Source %D January 2, 2008 %T Birefringence %I Davidson College Dept of Physics %V 2016 %N 28 July 2016 %8 January 2, 2008 %9 image/jpeg %U http://webphysics.davidson.edu/alumni/milee/jlab/crystallography_www/birefringence.htm
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