cle of radius c and an ellipseof semi-axes a and b. Tins,, sections are shown in order infigure 113. which is drawn on the assumption that a is greaterthan b, and b than c. If it should happen that any two ofthese quantities are equal, the crystal would become uniaxial.[f all three are equal, it… … Figure 113 111. Polarization by reflection.—In 1810 Malus discov-ered quite by accident that the light reflected from glass is ingeneral partly polarized. In looking through a plate of tourma-line at a glass window from which the direct light of the sunwas reflected, he found that when the…
Light
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