Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 302
ne ofthe colored rays has a distinct and separatefocal distance. Hence the object of a com-bination of lenses is to bring the coloredrays to one point, where they are reunitedinto white light. If we bring the face ofone prism up against the face of another,we recombine those prismatic rays… … start with a colored image whose parallelrays fall upon a lens of flint glass, that lensrepresenting virtually two prisms placedwith two of their faces together. Suppos-ing we use a double convex lens, repre-senting the conditions of two prisms placed 286 The Photographic Art-Journal. May, edge to…
Photography · Art and photography
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