doubly refracting crystal — An Etymological Dictionary of Astronomy and Astrophysics

doubly refracting crystal

بلور ِ شکست ِ دوتایی

bolur-e šakst-e dotâyi

Fr.: cristal à double réfraction

A → transparent → crystalline substance (such as calcite, quartz, and tourmaline) that is → anisotropic relative to the → speed of light. A ray incident normally on such crystals is broken up into two rays in traversing the crystal, → ordinary ray and → extraordinary ray.

See also: → doubly; → refracting; → crystal.

An Etymological Dictionary of Astronomy and Astrophysics