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 38
lver, or a silvered glass, will reflect the waves of light,and so, though in an inferior degree, will any othermaterial if only its surface be sufficiently smooth. Bysufficiently smooth I mean that the ridges or scratchesor roughnesses of its surface are decidedly smaller thanthe wave-length of the… … the waves; and such surfaces are, for optical purposes,quite smooth. Indeed that is the usual way ofpolishing things. You scratch them all over with somesort of very fine powder that makes scratches finer thanof an inch. J 0 0 o o o Now the rebound of waves when they beat against apolished surface,…
Light · X-rays
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