Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
nd render them suitablefor such optical instruments as the telescope, microscope, etc., has ledto a combination of lenses, Avhich has the effect of neutralizing theirdispersive, by partly destroying their refractive, power. Such lenses consist of a combination of two or more lenses of diffe-rent… … base) will refract the parallel lines, HN, to its principal focus, F, at-tended with the prismatic colors. If, however, the double concave OPTICS. 251 crown-glass lens T, having its concavity equal to tlie convexity of L,be placed in the position as shown, it will act as two prisms, apex toapex,…
Physics · Astronomy
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