Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 368
s surface.According to a fundamental law ofoptics, if a ray of light passes from ararer to a denser medium, it is benttoward the perpendicular to the surfacewhich separates the two media; but ifit passes from a denser to a lightermedium, it is bent from that perpen-dicular. This law is true when… … Fig. 37 380 NAVIGATION A ray of light from S meeting the atmosphere at P will bebent toward the perpendicular to the arc PP at P. As thedensity of the atmosphere increases from P to O, PO will bea curve, and the star will be seen in the direction OS tangentto PO at 0, the last direction of the ray…
Trigonometry · Surveying · Navigation
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
