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 65
de of calcium in water of different densities — thedensest at the bottom.You note that the beamof light sent into thetrough takes a curvedpath (Fig. 32). In fact, the light turns round a corner.The difference of refractivity that accompaniesdifference of density is well shown by a very… … LIGHTS AND SHADOWS 49 from your hand, or even from a hot poker? Or didyou ever see the eold air descending below a lump ofice? This is exceedingly easy to show you. All Irequire is a very small luminous point. We will takethe light of an arc-lamp, shining through a small holein a metal diaphragm…
Light · X-rays
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