. Polarisation of light . larisation of quartz in the colours producedby a beam of parallel rays of polarised light. Itwill be worth while to examine the modificationwhich the rings and brushes undergo from thesame cause. It has been explained that a ray ofplane-polarised light in traversing a crystal of quartzin the direction of its axis is divided into two, thevibrations of which are circular, one right-handed, theother left. If the ray traverses the crystal in adirection perpendicular to the axis, and if the originalvibrations are neither parallel nor perpendicular tothe axis, it is also di
. Polarisation of light . larisation of quartz in the colours producedby a beam of parallel rays of polarised light. Itwill be worth while to examine the modificationwhich the rings and brushes undergo from thesame cause. It has been explained that a ray ofplane-polarised light in traversing a crystal of quartzin the direction of its axis is divided into two, thevibrations of which are circular, one right-handed, theother left. If the ray traverses the crystal in adirection perpendicular to the axis, and if the originalvibrations are neither parallel nor perpendicular tothe axis, it is also divided into two, whereof thevibrations are not circular, but rectilinear. It wassuggested, first by Sir G. Airy, that these circularand rectilinear vibrations are limiting cases of ellip-tical ; and both theory and experiment tend to con-firm the suggestion, by showing that if the ray beincident on the crystal in any direction oblique tothe axis, it is divided into two, the vibrations of which POLARISATION OF LIGHT. [ Fig. 24.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
