Open AccessThe double refraction of quartz along the optic axis
Author(s) -
H. A. Ferreira
Publication year - 1932
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1932.0030
Subject(s) - quartz , refraction , optical axis , optics , uniaxial crystal , geology , materials science , physics , lens (geology) , composite material
1. The double refraction of quartz along the optic axis was shown experimentally for the first time in 1822 by Fresnel with his triprism. In 1869 von Lang measured the refractive indices of quartz for sodium light in five directions nearly parallel to the axis (+ 4°39' to - 5°6'); and the best results he obtained were 1·5441887 and 1·5442605.