Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 109
ass concave lensbe interposed it will, by means of its action in a contrary-direction, undo all the dispersion due to this first lensand a certain amount of deviation, so that we shall getthe combination giving an almost colourless image at B. It will not be absolutely colourless, for the… … Fi(i. 45.—Couibiiiatiou of Fliut- and Crown-glass licnses in an Achromatic Lens. important differences. When we expand the spectraconsiderably, we see that the action of these differentsubstances is not absolutely uniform, some colours ex-tending over the spectrum further than others. In thecase of…
Astronomy · Telescopes
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