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 60
onably magnifies. I immerse it in this bath ofoil—and behold it acts as a minifying lens—it makesthe beam diverge instead of converge! Carry theargument on to its logical conclusion. If the effect ofthe medium is so important, what would be the effectof taking a lens of air (enclosed between two… … ---=^F Fig. 27. lens in oil like a concave glass lens in air. Let us put it to the test of experiment. Here is a concave air lens. In air it neither converges nor diverges the light—the speed inside and outside the lens is the same — therefore there is noaction. But plunge it in oil (Fig. 27) and,…
Light · X-rays
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