Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 264
osely the rays distinguish-ed by their colors. By referring to the table of the refrac-tive powers of transparent bodies it will beseen that for a beam of white light, thedifference between the most refractoryflint glass and crown gTass, in their refract-ing powers, is as 202S is to 1 534, andthis… … 8 the red rays, and we grind to fit it a flintglass lens, the refractory power of w> ichwould place the foci of the rays at r, <J, itwdl be seen that the result of such a com-bination would be the formation of a color-less image, at a mean point between them,by recombining the rays into white…
Photography · Art and photography
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