Handbook of optics for students of ophthalmology (1899)
Souter, William Norwood, 1961-1935 · New York, Macmillan · leaf 23
um. See Fig. 4. We have learned that - = n, where n is the sin r REFRACTION AT PLANE SURFACES 13 ratio of the velocity of light in the first medium toits velocity in the second medium. If the velocityin a vacuum is taken as the standard, the ratio ofthe velocity in any medium to the velocity in… … Fig. 4. of the first medium and nf that of the second, the nrelative index for the two media will be —. Snells n law thus becomes n • sin i— n • sin r, and it is usuallywritten in this form. 14 HANDBOOK OF OPTICS In any refraction the greater the angle of inci-dence, the greater will be the…
Eye · Lenses
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