American Heritage® Dictionary of the English Language, Fourth Edition
- n. See birefringence.
GNU Webster's 1913
- adj. (Opt.) See Refraction.
- n. (Opt.) the refraction of light in two directions, which produces two distinct images. The power of double refraction is possessed by all crystals except those of the isometric system. A uniaxial crystal is said to be
optically positive(like quartz), or optically negative(like calcite), or to have positive, or negative, double refraction, according as the optic axis is the axis of least or greatest elasticity for light; a biaxial crystal is similarly designated when the same relation holds for the acute bisectrix.
- n. splitting a ray into two parallel rays polarized perpendicularly
“He extended the work of Huyghens and others on double refraction and developed the well-known theory which bears his name.”
“Having pursued with much zeal the study of optics, and experimented largely and carefully on the double refraction and polarization of light, he compiled a treatise on the subject for the “Encyclopaedia M.tropolitana” It has been translated into French by M. Quetelet; and both foreign and English men of science have been accustomed to regard it as indicating a new point of departure in the important branch of science to which it is devoted.”
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An extract from the "Zold Tolmacs" project, a HU-EN environmental dictionary compiled by Robert Gulyas in 2000.
dactylis glomerata, daily allowance, daily contact zone, daily cycle of tides, daily intake level, daily mortality rate, daily office and ..., daily peak, daily range in va..., daily runoff regu..., daily SO2 levels, dairy cattle and 5213 more...
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