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" ... as follows. From the distance between the image and the object in feet, subtract the focal distance of the lens in feet, and divide the remainder by the same focal distance. By this quotient divide twice the distance of the object in feet, and the... "
Optics: Light and Sight Theoretically and Practically Considered, with Their ... - Page 40
by Edward Nugent - 1870 - 268 pages
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A Treatise on Optics...: First American Edition, with an Appendix ...

David Brewster, Alexander Dallas Bache - 1833 - 95 pages
...lens, when the eye views, at the distance of 6 inches, the image formed by the lens, is as follows. From the distance between the image and the object in feet, subtract the local distance of the lens in feet, and divide the remainder by the same focal distance. By this quotient...
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Chambers's Information for the People, Volume 2

William Chambers, Robert Chambers - 1842
...distance, is, according to Sir David Brewster, as follow» :— " From the distance between the image and object in feet, subtract the focal distance of the lens in feet, »ni divide the remainder by the same focal distance. By this quotient divide twice the distance of...
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A Treatise on Optics

David Brewster - 1845 - 95 pages
...lens, when the eye views, at the distance of 6 inches, the image formed by the lens, is as follows. From the distance between the image and the object...focal distance of the lens in feet, and divide the remamder by the same focal distance. By this quotient divide twice the distance of the object in feet,...
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Theory and Practice of the Photographic Art: Including Its Chemistry and ...

Marcus Sparling - 1856 - 212 pages
...distance, is, according to Sir David Brewster, as follows :— " From the distance between the image and object in feet, subtract the focal distance of the...of times that the apparent magnitude of the object it increased. When the focal length of the lens is quite inconsiderable, compared with the distance...
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Orr's Circle of the Sciences: Practical chemistry

William Somerville Orr - 1856
...distance, is, according to Sir David Brewster, as follows :— " From the distance between the image and object in feet, subtract the focal distance of the...the object in feet, and the new quotient will be the magni- [ fying power, or the number of times that the apparent magnitude of the object is increased....
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