Calcite birefringence. Calcite crystal (calcium carbonate,CaCO3) showing strong birefringence (double refraction). This transparent variety called Iceland spar is used for optical purposes. The strong birefringence causes objects viewed through a clear piece of calcite to appear doubled. The birefringent effect (using calcite) was first described by the Danish scientist Rasmus Bartholin in 1669. The double image is really made up of two images each with a different polarization orientation. The images can be separated with the use of a polarization filter | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Kinsman, Ted |
Taille de l’image : | 5616 px × 3744 px |
Model Release : | Non requis |
Property Release : | Non requis |
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