Elements of natural philosophy (Volume 2-3) . 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\
Elements of natural philosophy (Volume 2-3) . 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, refraction. Fi?. 95.
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