Light: A Course of Experimental Optics, Chiefly with the Lantern

adjusted aperture apparatus appear arranged axes azimuths balsam bands beam beautiful bi-axial blue calcite centre circular circularly-polarised colour common light complementary colours convergent crossed crystal dark David Brewster diffraction direction disc dispersion distance double refraction double-image prism easily edge effects elasticity ether experiment focus focusing give glass heat horizontal index of refraction interference lantern law of sines lens lenses lines mica MICA-FILM microscope mirror molecules motion mounted Newton's rings Nicol Nicol prism nozzle object optic axis orbit ordinary parallel particles passing pencil perpendicular phenomena piece plane-polarised polariscope polarised light polariser and analyser polarising planes position produced quarter-wave plate quartz rays reflected retardation right angles rings rotated round screen seen selenite shown in Fig slide slide-stage slit spar spectra spectrum square superposed surface theory thickness tion tourmaline tube uni-axial vertical vibrations wave plate wave-length waves wedge