Elements of natural philosophy (Volume 2-3) . ELEMENTS OF OPTICS. 329 Ficr. will begin, and the re-fracted portion will in-crease while the reflectedportion will diminish, tillthe tube B has been turn-ed through an angle equalto 90°, as indicated by thegraduated circle C, on the tube A ; in which position of the reflector, the beam willbe totally refracted. Continuing to turn the tube B, thereflexion from M N will increase, and the refractionwill decrease, till the angle is equal to 180°, when theplane of the first reflexion will be again perpendicularto M Jf\ and the whole beam will be r
Elements of natural philosophy (Volume 2-3) . ELEMENTS OF OPTICS. 329 Ficr. will begin, and the re-fracted portion will in-crease while the reflectedportion will diminish, tillthe tube B has been turn-ed through an angle equalto 90°, as indicated by thegraduated circle C, on the tube A ; in which position of the reflector, the beam willbe totally refracted. Continuing to turn the tube B, thereflexion from M N will increase, and the refractionwill decrease, till the angle is equal to 180°, when theplane of the first reflexion will be again perpendicularto M Jf\ and the whole beam will be reflected ; beyondthis, reflexion will again diminish, and refraction increase,till the angle becomes 270°, when the beam will be to-tally refracted; after passing this point, the same phe-nomena will recur, and in the same order, as in thesecond quadrant, till the tube is revolved through 360°,when the restoration of the reflected wave will be com-plete. The same phenomena would have occurred hadthe second reflector been presented to the refracted com-ponent of the origin
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