Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 396
e law of refraction was left toWillebrod Snell, professor of the University of Leyden, 1621. Iwill briefly state this very important discovery, which elevated opticsto a positive science. If a ray of light, R (Fig. 2), falls perpendic-ular upon a plane surface of a piece of glass,A B, it enters the… … Whole No. Vol. CI.—(Third Series, Vol. LXXI.) 24 338 Chemistry, Physics, Technology, etc. N erect perpendiculars from the points m and n, and also from the pointsm and n, to the normal R D, and -divide the length o m hy np andalso divide om by np, we will have in both cases the same quotient,or, as…
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