 The angular magnification of a telescope is therefore equal to the ratio of the focal length of the objective to that of the ocular.  Physics - Page 395by Charles Riborg Mann, George Ransom Twiss - 1905 - 449 pagesFull view - About this book
 | Science - 1894 - 904 pages
...is a single double-convex lens. With such a lens the magnifying power of the telescope is measured by the ratio of the focal length of the objective to that of the eye lens. Suppose the first is sixty inches and the latter half an inch ; then the magnifying power... | |
 | William Henry Chandler - Encyclopedias and dictionaries - 1898 - 630 pages
...and has its axis parallel to that of the large one. Roughly, the magnifying power of a telescope is the ratio of the focal length of the objective to that of the eyepiece. Roger Bacon understood the principles on which the telescope depends ab.1250; so perhaps did Giambatista... | |
 | Garrett Putman Serviss - Astronomy - 1901 - 220 pages
...is a single double-convex lens. With such a lens the magnifying power of the telescope is measured by the ratio of the focal length of the objective to that of the eye lens. Suppose the first is sixty inches and the latter half an inch; then the magnifying power... | |
 | Silas Ellsworth Coleman - Physics - 1908 - 284 pages
...the difference between the focal lengths of the lenses. 2. Compare the estimated magnification with the ratio of the focal length of the objective to that of the eye lens. 3. Copy Figure 82 and answer the questions under 4 of the discussion at the end of the preceding... | |
 | Charles Elijah Linebarger - Experiments - 1911 - 186 pages
...power of a telescope is equal to (a) the ratio of the size of the image to that of the object; (6) the ratio of the focal length of the objective to that of the eye piece. How do the values of the magnifying power measured by the two methods compare? TABULATION... | |
 | William Watson - Physics - 1920 - 590 pages
...image, which ratio is called the magnification, is f/f. Thus the magnification of a telescope depends on the ratio of the focal length of the objective to that of the eye-piece. The diameter of the objective has no effect on the magnification, although owing to diffraction a shorter... | |
 | Encyclopedias and dictionaries - 1920 - 892 pages
...France about 1850. The magnifying power of telescopes is usually expressed in diameters and is indicated by the ratio of the focal length of the objective to that of the combination of lenses forming the eye-piece. For example, the Lick telescope has a focal length of... | |
 | United States. Army. Ordnance Department. War Department - 1921 - 328 pages
...by the ratio of the diameter of the entrance pupil to that of the exit pupil, and these in turn are determined by the ratio of the focal length of the objective to that of the eyepiece. Another method for ascertaining the linear magnifying power is to measure the angular vergency of the... | |
 | United States. Army. Ordnance Department - Glass manufacture - 1921 - 328 pages
...by the ratio of the diameter of the entrance pupil to that of the exit pupil, and these in turn are determined by the ratio of the focal length of the objective to that of the eyepiece. Another method for ascertaining the linear magnifying power is to measure the angular vergency of the... | |
 | Le Roy Dougherty Weld, Frederic Palmer - Physics - 1925 - 760 pages
...principal focus, ec = /. Therefore M = F.- (242) Thus the magnifying power of a telescope is given by the ratio of the focal length of the objective to that of the eyepiece. A large magnifying power may be obtained by using an eyepiece of short focal length. The practical... | |
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