Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 706
r — 2 + + — $\. In order that the emergent wave shall be plane, it is neces-sary that portions of the wave entering very near a shallemerge with the same deviation. Comparing equations 2 and 3,it appears that this will be thecase when (4) $ = (m _j_ 1) ^ To find the value of i corre-sponding to… … qov = r, 696 OPTICAL PHENOMENA OF THE ATMOSPHERE. because, by construction, sin pov = n sin qov. Similarly, drawing uq near and parallel to uq, ■pop = <£, and qoq = sjr. Draw ps and qt perpendicular to ov. Then, because theirsides are perpendicular, the triangle psp1 is similar to puo, andqtq*…
Physics
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