Polarisation of Light |
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Common terms and phrases
analyser be turned angle of incidence axis bands beam bi-axal crystals biquartz centre circular polarisation circularly coincide complementary complementary colours consequently crystal plate cut perpendicularly dark diaphragm difference of phase different colours double refraction effect ellipses equal ether exhibit extinguished field of view film glass hyperbolas Iceland spar inclined instrument intermediate left-handed mean-line motion Nicol Nicol's prism oblique opposite optic axes ordinary ordinary ray orthorhombic overlap pair parallel particle perpendicular phenomena placed plane containing plane of polarisation plane of reflexion plane of vibration plane-polarised plate of quartz polar clock polariscope polarised light polariser and analyser polarising angle position principal planes principal section produced quadrants quarter-undulation plate quartz plate rectilinear reflected refracted rays retardation rhombohedron right angles right-handed rotation seen selenite silver plate spectrum straight lines successive polarisation surface thickness tints tion traversed tube turned round uni-axal velocity wave length wedge
Popular passages
Page 151 - SOUND : a Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Sound, for the use of Students of every age. By AM MAYER, Professor of Physics in the Stevens...
Page 151 - ON BRITISH WILD FLOWERS CONSIDERED IN RELATION TO INSECTS.
Page 9 - ... the technical language of science, may be thus enunciated : The tangent of the polarising angle is equal to the refractive index. Simple geometrical considerations, combined with the usual expressions for the laws of reflexion and refraction, will show that this relation between the polarising angle and the refractive index may be also expressed in the following way : If light be incident at the polarising angle, the reflected and refracted rays will be at right angles to one another. In Fig....
Page 138 - Lord Rayleigh, and others. And the combinations have been effected sometimes by causing two spectra at right angles to one another to overlap, and sometimes by bringing images of various parts of a spectrum simultaneously upon the retina. Latterly also W.
Page 129 - ... and 90° the rings will be contracted and extended in opposite quadrants, until at 45° they are divided by two diagonals, on each side of which the colours are complementary. Beyond 45° the rings begin to coalesce, until at 90° the four quadrants coincide again.
Page 151 - LIGHT: A Series of Simple, Entertaining and Useful Experiments in the Phenomena of Light for the Use of Students of every Age.
Page 75 - ... directions, which respectively bisect the angles formed by the two optic axes : the line which bisects the smallest angle is called the intermediate section ; and the line perpendicular thereto which bisects the supplementary angle is called the supplementary section. These definitions being premised, if a film of selenite is placed on the diaphragm with its intermediate section to the left of the plane of reflexion, the successive polarisation is direct or right-handed ; if, on the contrary,...
Page 84 - ... at right angles to the first. Hence, if the plate be turned round through 90° we shall see that the bands are shifted in a direction opposite to that in which they were moved at first. In this therefore we have evidence not only that the polarization immediately on either side of a band is circular ; but also that that immediately on the one side is right-handed, while that immediately on the other is left-handed.
Page 75 - ... the colours descend, and when it is on the right of the same plane the colours ascend, the analyser being turned from left to right. " It has been determined that the ordinary ray, both in positive and negative crystals, is polarised in the principal section, while the extraordinary ray is polarised in the section perpendicular thereto. It is also established that the index of refraction is inversely as the velocity of transmission. It follows from the above experimental results, therefore, that...