A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 298
he formula, de X ac t — XLt ao The student may himself estimate wave-lengths inthis way. For a human eye in its normal condition(see IT 115) the average wave-length in a candle-flamehas been found to be about 60 millionths of a cen-timetre. We may make use of this fact to estimatethe distance (t?)… … 1 130, I.] DIFFRACTION OF ilGHT. 267 henoe if the augie be measured, the ratio can befound from Table 3. ^ 130. Determinatioii of Angles of Diffraction. —An ordinary diffraction grating (see § 101) consistsof a set of parallel and equidistant lines ruled orphotographed on glass (Fig. 117). A…
Physics
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