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Books Books 1 - 10 of 43 on The angular magnification of a telescope is therefore equal to the ratio of the focal....  
" The angular magnification of a telescope is therefore equal to the ratio of the focal length of the objective to that of the ocular. "
Pleasures of the Telescope: An Illustrated Guide for Amateur Astronomers and ... - Page 9
by Garrett Putman Serviss - 1901 - 200 pages
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The Popular Science Monthly, Volume 45

Harry Houdini Collection (Library of Congress) - Technology - 1894
...fact that any distortion at the surface of a mirror affects the direction of a ray of light three time as much as the same distortion would do at the surface...the magnifying power will be a hundred and twenty diameters ie, the disk of a planet, for instance, will be enlarged a hundred and twenty times along...
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Chandler's Encyclopedia: An Epitome of Universal Knowledge ...

William Henry Chandler - Encyclopedias and dictionaries - 1898
...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...
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Physics

Charles Riborg Mann, George Ransom Twiss - Physics - 1905 - 449 pages
...objective, and L'F is that of the eyepiece; so we see that the magnification of the telescope is determined by the ratio of the focal length of the objective to that of the eyepiece. Therefore, if we wish to make telescopes that shall have large magnifying powers, we must...
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The Elements of Physics

Silas Ellsworth Coleman - Physics - 1906 - 439 pages
...proportion, we have angle aEb : angle a Ob = F\f 3*9 (approximately) ; that is, the magnifying power is measured by the ratio of the focal length of the objective to the focal length of the eyepiece. The objective is of large diameter in order to receive as much light...
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New Laboratory Manual of Physics

Silas Ellsworth Coleman - Physics - 1908 - 264 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 experiment....
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Text-book of Physics

Charles Elijah Linebarger - Physics - 1910 - 471 pages
...gives a total magnification equal to x - =J The 1nag25 // nifying power of an astronomical telescope is measured by the ratio of the focal length of the objective to the focal length of the eyepiece. A high magnifying power, then, is secured by using an objective of...
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A Laboratory Manual of Physics for Use in Secondary Schools

Charles Elijah Linebarger - Experiments - 1911 - 175 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 /....
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Elements of Physics

R.A. Houstoun - 1919
...the eyepiece ; then by the graphical construction we find that a virtual image of ME is formed at HG. The magnifying power of the telescope is measured by the ratio of the angle subtended at the eye by the image in the telescope to the angle subtended by the distant object...
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The Encyclopedia Americana: A Library of Universal Knowledge, Volume 26

Encyclopedias and dictionaries - 1920
...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...
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Manufacture of Optical Glass and of Optical Systems, a War-time Problem, May ...

United States. Army. Ordnance Dept. War Department - 1921 - 307 pages
...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...
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