Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 263
ed disc, leaving only a small por-tion of the edge for the light to passthrough, and throw its image on a screen,we shall find it will be bordered withfringes of color. At one distance red willprevail, at another violet. This is the re-sult of chromatic aherration, and arisesfrom the unequal… … v v fall along the same circular line, theywill, being more ref;acted, meet at/. JNowif we place a disc at e, just the size of thecone of light, it will be edged with violet, but if we move it to a, the colored borderwill be red. The indices of refraction for the severalrays have been most…
Photography · Art and photography
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