Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 90
rposition at once leads to a genera] formula, expressingthe sum of the two actions of the mirror on the wave ; itreverses its initial curvature, and then imprints a Icurvature upon it. In symbols, V=-Ua-F . . [18] The application of wave principles to find the directionof a refracted beam is best… … Fig. 43. During the time that light (of any colour) would travel 1foot in air, red light would travel about 7^ inches in glass,and violet light about 7 inches in glass. The velocity-con-stant for glass of this kind is 0-625 for red waves, and0-583 for violet waves. Let EF be the surface of…
Light · X-rays
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