The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Fig. 182.—Tourmalin Pjates. light is again transmitted (Fig. 182). The tourmalin, plates, if sufficiently thick, completely extinguish the ordinary ray. Polarisation by reflection of light was dis- covered by Malus in 1810. An apparatus for pro- ducing it is shown in Fig. 183. When a ray of light falls on an unsilvered polished surface of glass, placed at a particular angle to
The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 Fig. 182.—Tourmalin Pjates. light is again transmitted (Fig. 182). The tourmalin, plates, if sufficiently thick, completely extinguish the ordinary ray. Polarisation by reflection of light was dis- covered by Malus in 1810. An apparatus for pro- ducing it is shown in Fig. 183. When a ray of light falls on an unsilvered polished surface of glass, placed at a particular angle to the incident ray, the reflected ray is polarised. This may be shown by permitting the ray to fall on a prism of Iceland spar, when the phenomena already described will be produced. It is also shown by receiving the reflected ray on a second reflecting surface placed at the same angle as the former. If the surfaces are parallel the light from the second surface will be perceived by an eye placed in the direction of the reflected ray. If the second surface be now turned the intensity of the light diminishes, till when the two surfaces are at right angles it is extinguished, but is again reflected on turning till the surfaces are again parallel. The Fig. 183 shows the two reflecting surfaces A and B,
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