Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 301
na going on,but interrupted, and often obliterated, bythe influence of Light^ as manifested inthe colored rays. Now we find that theseprinciples do not obey—which is the par-ticular point to which we have to directour attention—the same order of refrangi-bility in passing through any… … the glass than the luminous focus, L, whichis still nearer than the focus for heat, H.The chromatic dispersion of the raysthrough a glass of this kind is shown by blackening its centre, and then taking adisc of paper and passing it along the lineof the rays; where the rays diverge at h,h\ we shall…
Photography · Art and photography
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