A dictionary of photography for the amateur and professional photographer (1889)
Wall, E. J. (Edward John), 1860-1928 · New York : E. & H.T. Anthony · leaf 194
nd decomposed as above ; but by placing another lens or set of prisms in close contact with the first, the decomposed light is reunited, and re-forms white light. It is this principle which guides opticians in making their lenses achromatic. As the most actinic rays reside in the violet portion of… … these colours in a landscape or picture have but tittle effect in forming the latent image, and therefore show as black in the finished print ; but as these rays are the most visible, and would form the image on the focussing-screen, it is obviously necessary to make the violet and yellow rays…
Photography
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