Elements of natural philosophy (Volume 2-3) . 170 NATURAL PIIILOSOniT. Refractiveindices and The following table shows the value of m, and Vi, forthe different substances named, the value of m baing powers _ _, _ ^ ° determined by taken on the passage oi light trom a vacuum. experiment; TABLE Of Refractive Indices and Refractive Powers. Substances. Chromate of Lead, Realgar,Diamond, restive indices GlaSS-flint, and powers. Glass Crown,Oil of Cassia,Oil of Olives,Quartz, Muriatic Acid,Water,Ice, Hydrogen,Oxygen,Atmospheric Air, m 2 i to — l • 8 ( 2,97{2,50 1,0436 2,55 1,666 1,4566 1,57 0,7
Elements of natural philosophy (Volume 2-3) . 170 NATURAL PIIILOSOniT. Refractiveindices and The following table shows the value of m, and Vi, forthe different substances named, the value of m baing powers _ _, _ ^ ° determined by taken on the passage oi light trom a vacuum. experiment; TABLE Of Refractive Indices and Refractive Powers. Substances. Chromate of Lead, Realgar,Diamond, restive indices GlaSS-flint, and powers. Glass Crown,Oil of Cassia,Oil of Olives,Quartz, Muriatic Acid,Water,Ice, Hydrogen,Oxygen,Atmospheric Air, m 2 i to — l • 8 ( 2,97{2,50 1,0436 2,55 1,666 1,4566 1,57 0,7986 1,52 1,63 1,3308 1,47 1,2607 1,54 0,5415 1,40 1,33 0,7845 1,30 1,000138 3,0953 1,000272 0,3799 1,000294 0,4528 DEVIATION OF LIGHT AT PLANE SURFACES. Deviation oflight at planesurfaces; § 19. Let MN, be adeviating surface, sep-arating any medium i?,from a vacuum A. Aray of light S i>, beingincident at Z>, will beillustration and deviated according to explanation; 1 ° the law expressed byEquation (3), sin 9 = m sin 9, Fis. ELEMENTS OF OPTICS. iff m, being the index of refraction of the medium B. The Deviationuf u„.refracted ray D D\ meeting a second surface M N\ par- first refractedallel to the first, and passing again into a vacuum, will be ™y;refracted so as to satisfy the Equation, sin 9 = mf sin 9, the angle of incidence 9, on the second surface being thesame as that of refraction at the first, and m, the indexof refraction from the medium B to the vacuum. But,in this case, Equation (2), -J-T, ^ Index of _ t • refraction from j7 /ffi medium to vacuum: whence, substituting this value of m, and multiplyingthe two preceding Equations together, we obtain, Sin 9 = Sin 9, Operations 7 performed; that is, the ray after passing a medium bounded by paral- . Couclusion in lei plane faces, is not ultimately deviated, but remains pa- to its first direction. The ray D D\ being supposed to traverse a second same true formedium bounded by parallel pla
Size: 1500px × 1666px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmechanics, booksubjectopticsandphoto
