Polarisation of LightMacmillan and Company, 1891 - 151 páginas |
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Página 30
... selenite be placed , the field will remain dark as before . The selenite is , in fact , a doubly refracting crystal , and although neither of the rays to which it gives rise follows the ordinary law , yet they may , for sake of ...
... selenite be placed , the field will remain dark as before . The selenite is , in fact , a doubly refracting crystal , and although neither of the rays to which it gives rise follows the ordinary law , yet they may , for sake of ...
Página 31
... selenite be considerable , the field when bright will be colourless ; but if it be inconsiderable , say not more than that of a thin visiting card , the field will be brilliantly coloured with tints depending upon the thickness of the ...
... selenite be considerable , the field when bright will be colourless ; but if it be inconsiderable , say not more than that of a thin visiting card , the field will be brilliantly coloured with tints depending upon the thickness of the ...
Página 37
... remembered that the two sets of vibrations into which the selenite has divided the polarised ray are at right angles to one another ; secondly , that one set is retarded behind the other III . ] 37 POLARISATION OF LIGHT .
... remembered that the two sets of vibrations into which the selenite has divided the polarised ray are at right angles to one another ; secondly , that one set is retarded behind the other III . ] 37 POLARISATION OF LIGHT .
Página 38
... selenite , when the plate is of such a thickness as to cause a retardation equal to one or to any whole number of wave lengths . Turn the wires about their middle lines M N M'N ' until they meet half - way , i.e. in a position inclined ...
... selenite , when the plate is of such a thickness as to cause a retardation equal to one or to any whole number of wave lengths . Turn the wires about their middle lines M N M'N ' until they meet half - way , i.e. in a position inclined ...
Página 39
... selenite when the plate is of such a thickness as to cause a retardation of a fraction of a wave length equal to the amount of shift . And on turning the wires as before , we should find that in one image the waves partially combine ...
... selenite when the plate is of such a thickness as to cause a retardation of a fraction of a wave length equal to the amount of shift . And on turning the wires as before , we should find that in one image the waves partially combine ...
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Términos y frases comunes
analyser be turned angle of incidence axis bands beam bi-axal crystals biquartz centre circular polarisation circularly coincide complementary complementary colours consequently Crown 8vo crystal plate cut perpendicularly dark difference of phase different colours double refraction effect ellipses equal ether exhibit extinguished field of view film glass hyperbolas Iceland spar inclined instrument intermediate laminæ 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 section produced quadrants quarter-undulation plate quartz plate rectilinear reflected ray retardation rhombohedron right angles right-handed rotation secondary figures seen selenite silver plate spectrum straight lines successive polarisation surface thickness tints tion traversed tube turned round uni-axal velocity wave length wedges
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