ill evidently be greaterfor the ray FD than for ED, since FD is more inclined to theaxis and has also a longer path within the crystal. The square area in figure 122 represents the crystal slipas seen from above, the optic axis now being perpendicular tothe paper. Let 0 be the point of emergence of… … Figure 122 ED will be the same as for any other ray such as ED whichemerges from the crystal at the same distance from the point0 of figure 122. Therefore, if in the latter figure we drawcircles about 0, the phase-difference between the ordinary andthe extraordinary rays on emergence will be the…
Light
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-445-176.webp)
