 | Sir Richard Phillips - 1807 - عدد الصفحات: 212
...three eye glasses have all their focal distances equal, and the magnifying power is found as before, by dividing the focal distance of the object-glass by the focal distance of one of the eye-glasses. 277- The camera obscura is made by fixing a convex glass in a hole of a window... | |
 | George Gregory - 1808 - عدد الصفحات: 452
...glasses, the image may be seen upright. The magnifying power of this, which is called the dioptric telescope, is found by dividing the focal distance...object-glass by the focal distance of the eye-glass, and the quotient expresses the magnifying power. The greatest inconvenience attending dioptric or refracting... | |
 | Jeremiah Joyce - 1809 - عدد الصفحات: 290
...Tutor. Yes; the three glasses next the eye having their focal distances equal, the magnifying power is found by dividing the focal distance of the object-glass by the focal distance of .one of the eye-glasses. We have now said as much on the subject as is necessary to our plan. Charles.... | |
 | Edward Augustus Kendall - 1811 - عدد الصفحات: 476
...the other focus, the image will be viewed under the angle geh, and will of course appealmagnified. The magnifying power of this telescope is found by...distance of the : object-glass by the focal distance of tbe eye-glass : thus if the focal •distance of the lens op be 120 inches, and it admit of an eye-glass... | |
 | Sir Richard Phillips - 1811 - عدد الصفحات: 196
...three eye-glasses have all their focal distances equal, and the magnifying power is found, as before, by dividing the focal distance of the object-glass by the focal distance of one ot the eye-glasses. 275. The camera obscura is made by fixing a convex glass in a hole of a window... | |
 | Edward Augustus Kendall - 1811 - عدد الصفحات: 462
...> k. The three eyeglasses have all their focal distances equal, and therefore the magnifying power is found by dividing' the focal distance of the object-glass by the focal diftance of either of the eye-glasses. The reflecting telescope may be thus described : let ab fig.... | |
 | Jeremiah Joyce - 1815 - عدد الصفحات: 468
...Tutor. Yes ; the three glasses next the eye having their focal distances equal, the magnifying power is found by dividing the focal distance of the object-glass by the focal distance of one of the eye-glasses. We have now said as much on the subject as is nesessary to our plan. Charles.... | |
 | Hewson Clarke, John Dougall - 1817 - عدد الصفحات: 902
...as before. The three eye-glasses have all the same focal distance ; and the magnifying power of the telescope is found by dividing the focal distance of the object-glass by that of any one of the eye-glasses, as was before said. When the rays of light are separated by refraction... | |
 | George Gregory - 1820 - عدد الصفحات: 458
...glasses, the image may be seen upright. The magnifying power of this, which is called the dioptric telescope, is found by dividing the focal distance of the object-glass by the focal VOL. I. K distance of the eye-glass, and the quotient expresses the magnifying power. The greatest... | |
 | Hewson Clarke, John Dougall - 1825 - عدد الصفحات: 892
...before. The, three, eye-glasses have all the same focal distance ; and the magnifying, power of the telescope is found by dividing the focal distance of the object-glass by that of any one of the eye-glasses, as was before said. When the rays of light are separated by refraction... | |
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The magnifying power of a telescope of this construction is found by dividing the focal distance of the object-glass by the focal distance of the eye-glass. Thus, if the... 
