 | David Brewster, Alexander Dallas Bache - 1833 - 674 pages
...occupy a circle whose diameter is GH ; hence the image of the sun in the focus F will be a bright disc surrounded and rendered indistinct by a broad halo...light growing fainter and fainter from F to G and II. In like manner, every object seen through such a lens, and every image formed by it, will be rendered... | |
 | Charles Frederick Partington - 1838 - 1116 pages
...occupy a circle whose diameter UGH; hence the image of the sun in the focus F will be a bright disc, surrounded and rendered indistinct by a broad halo...rendered confused and indistinct by spherical aberration. The form assumed by the sun's disc is shown by the radial circles at the opposite extremity of the... | |
 | William Mackenzie - 1841 - 460 pages
...occupy a circle whose diameter is G H. Hence, the image of the sun in the focus F will be a bright disc, surrounded and rendered indistinct by a broad halo...rendered confused and indistinct by spherical aberration. Suppose such a lens as LL occupied the place of the crystalline, and that the retina were situated... | |
 | David Brewster - 1841 - 432 pages
...occupy a circle whose diameter is GH ; hence the image of the sun in the focus F will be a bright disc surrounded and rendered indistinct by a broad halo...rendered confused and indistinct by spherical aberration. These results may be illustrated experimentally by taking a ring of black paper, and covering up the... | |
 | William Mackenzie - 1841 - 326 pages
...occupy a circle whose diameter is G H. Hence, the image of the sun in the focus F will be a bright disc, surrounded and rendered indistinct by a broad halo of light, growing fainter and fainter from F to G K' I/ ' 1 ,\ L — • . __ — 1 / and H. In like manner, every object seen through such a lens, and... | |
 | David Brewster - 1844 - 464 pages
...a circle whose diameter is GH ; hence '" the image of the sun in the focus F will be a bright disc surrounded and rendered indistinct by a broad halo of light growing fainter snd fainter from F to G and H. In like manner, every object seen through such a lens, and every image... | |
 | David Brewster - 1845 - 436 pages
...disc surrounded and rendered indistinct by a broad halo of light growing famter and fainter from P to G and H. In like manner, every object seen through...rendered confused and indistinct by spherical aberration. These results may be illustrated experimentally by taking a ring of black paper, and covering up the... | |
 | Denison Olmsted - 1854 - 620 pages
...aberration. It is obvious that such a lens cannot form a distinct picture of any object in its locus F. If it is exposed to the sun, the central parts...of the rays which lie near the axis to pass through I he lens, then the rays all meet at or very near to the point F, and a much more distinct image is... | |
 | Denison Olmsted - 1857 - 468 pages
...object seen through such a lens. and every age formed by it, will be rendered confused and indistinct spherical aberration. If we cover up all the exterior portions of the lens. so as permit only those portions of the rays which lie near the is to pass through the lens- then the rays... | |
 | Edward Nugent (C.E.) - 1868 - 294 pages
...lens. It is quite clear that such a lens cannot form a distinct picture of any object in its focus F ; every object seen through such a lens, and every image...rendered confused and indistinct by spherical aberration. By actually projecting the refracted rays for lenses of different kinds, which we recommend to the... | |
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F will be a bright disc surrounded and rendered indistinct by a broad halo of light growing fainter and fainter from F to G and H. In like manner, every object seen through such a lens, and every image formed by it, will be rendered confused and indistinct... 
