Elements of natural philosophy (Volume 2-3) . nt directions by or-dinary reflexion and refraction, by the retardation or ac-celeration of one over the other, as in the case of double 7 Different ways of refraction, soon to be explained, or by absorbing one and causing thispermitting the other to pass unobstructed. Effect of separation. POLARIZATION BY REFLEXION AND REFRACTION. Polarization by § 134. It is ascertained that when a wave of common reflexion and bylight is incident on any transjiarent medium of uniform refraction;density, under a certain angle of incidence, called thepolarizing ang
Elements of natural philosophy (Volume 2-3) . nt directions by or-dinary reflexion and refraction, by the retardation or ac-celeration of one over the other, as in the case of double 7 Different ways of refraction, soon to be explained, or by absorbing one and causing thispermitting the other to pass unobstructed. Effect of separation. POLARIZATION BY REFLEXION AND REFRACTION. Polarization by § 134. It is ascertained that when a wave of common reflexion and bylight is incident on any transjiarent medium of uniform refraction;density, under a certain angle of incidence, called thepolarizing angle, the resolution above referred to, takesplace; the reflected and refracted waves become planepolarized, the former in the plane of reflexion, and thelatter in a plane at right angles to it. Both waves losealmost entirely the power of being again reflected or re-fracted when the surface of a second deviating medium introductoryis presented to either in a particular manner. remarks; 328 NATURAL PHILOSOPHY Fig. 93. Experimentalillustration:. Explanation ofapparatus; Appearancewhen theanalyzer isperpendicular tothe plane of firstreflexion: The same whenthe analyzer isrevolved throughany angle lessthan 90°; Fis. 94. Thus, If N and M N\ representing two plates ofglass, mounted upon swing frames, attached to two tubesA and B, which move freely one within the other abouta common axis, let the beam SD, of homogeneous hVht,be received upon the first under an angle of incidenceequal to 56° ; reflexion and refraction will take place ac-cording to the ordinary law, and if the reflected beamD D\ which is sup-posed to coincide withthe common axis ofthe tubes, be incidentupon the second re-flector under the sameangle of incidence,the reflector being per-pendicular to theplane of first reflex-ion, it will be totallyreflected, there beino-none refracted. But if the tube B,be turned about itsaxis, the tube A bein^at rest, the angle ofincidence on the p-lassM N\ will remainunchanged, refract
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