| David Brewster, Alexander Dallas Bache - 1833 - 674 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... | |
| William Chambers, Robert Chambers - 1842 - 938 pages
...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... | |
| David Brewster - 1845 - 436 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,... | |
| Marcus Sparling - 1856 - 216 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... | |
| William Somerville Orr - 1856 - 596 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...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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