sines which fix the size or magnitude of those angles. This law may be enun-ciated thus: The ratio or quotient of the sine of the angle of incidence i (Fig. 4) andthe sine of the angle of refraction r is invariably the same number for twogiven substances or media, namely the same number which we… … Fig. 5 If, after passing through a thickness of glass, the beam strikes a secondplane surface separating it from air, as in a piano-parallel plate (Fig. 5),the beam will be again deflected to the same extent but in a sense oppositeto that at the first refraction. The beam as a whole is shifted…
Lenses · Eyeglasses
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