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double refraction

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double refraction

In a crystal, when an unpolarized ray of light entering the crystal is split into two polarized rays, one of which does obey Snell's law of refraction, and the other does not. By looking through such a crystal, for example calcite, one can ‘see double’.



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Viewed at a certain distance from the naked eye under the illumination of a penlight, you will know a moissanite double refraction of light.
 
 
 
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