 | John M. Moffat - 1834 - 482 pages
...is termed the "principal focus" of the lens. And the parallel rays EA, E'C, and E"B, andalsoFA.F'C, and F" B, falling obliquely on the lens, will in a...at G and G", at the same distance behind the lens. It may be observed that the rays E'C G", D'CG', F'CG, passing through the centre of the lens, do not... | |
 | Walter R. Johnson - 1836
...the "principal focus" of Gf the lens. And the parallel rays EA, E' C, and E"B, and also F, A, F'C, and F" B, falling obliquely on the lens, will in a...termed the " focal distance" of the lens ; and in a double convex lens, formed of equal spherical surfaces, its length will be that of the radius of... | |
 | Walter Rogers Johnson - 1836
...the "principal focus" of Q" the lens. And the parallel rays EA, E' C, and E"B, and also F, A, F'C, and F" B, falling obliquely on the lens, will in a...the lens. 115. It may be observed that the rays E' C G",D' C G',F' CG, passing through the centre of the lens, do not alter their direction. C G' is termed... | |
 | Marcus Sparling, Francis Peabody - Photography - 1856 - 212 pages
...parallel rays EA, B" C, and E" B, and also FA, P* C, and F" B, falling obliquely on the lens, wul, in a similar manner, be refracted, and have their foci at G and G'', at the same distance from the lens. Those lines which pass through the centre, as E' С G" and F' CG, do not alter their... | |
 | William Somerville Orr - Science - 1856
...focal point G'. We now observe that the parallel rays EA, E' C, and E" B, and also FA, FC, and F" В, falling obliquely on the lens, will, in a similar manner, be refracted, and have their foci al G and G'', et the same distance from the lens. Those lines which pass through the centre, as £'... | |
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CG, passing through the centre of the lens, do not alter their direction. C G' is termed the "focal distance" of the lens; and in a double convex lens, formed of equal spherical surfaces, its length will be that of the radius of the sphere of which those... 