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" Without stopping to prove the principle, we may say that the magnifying power is simply equal to the quotient obtained by dividing the focal length of the object-glass by that of the eye-lens. It is to be noted, however, that a magnifying power of unity... "
Elements of Physics: Imponderable bodies. II. Electricity, electro-magnetism ...
di Carl Friedrich Peschel - 1846
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The economy of the eyes

William Kitchiner - 1825
...what he wished to have done, he first shewed the are used, the power of a glass is readily discovered by dividing the focal length of the object-glass by that of the eye-glass, in eye-pieces ot the common construction, especially those of a negative focus, it is very difficult...
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Letters of Euler on Different Subjects in Natural Philosophy ..., Volume 2

Leonhard Euler, Sir David Brewster - 1833
...ratio of Ihe magnifying power. When single lenses are used, the power of a glass is readily discovered by dividing the focal length of the object-glass by that of the eye-glan.— Am. Ett, piu^eu by near-sighted persons, which represents the images of objects at a very...
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Elements of natural philosophy

Golding Bird - 1839 - 120 pagine
...the same means as in the case of compound microscopes (367). The magnifying power of these telescopes is found by dividing the focal length of the object-glass by that of the eye-glass. 570. If a concave eye-glass be substituted for the lens CD in the last-described instrument, we have...
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The practical astronomer, comprising illustrations of light and colours [&c.].

Thomas Dick - 1845
...the focus of the eye-glass to be 1 inch, the magnifying power will be 10 times — which is always found by dividing the focal length of the object-glass by that of the eye-glass. The interval between the two glasses, in this case, will be 9 inches, which is the length of the telescope,...
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The Practical Astronomer

Thomas Dick - 1845 - 567 pagine
...the focus of the eye-glass to be 1 inch, the magnifying power will be 10 times — which is always found by dividing the focal length of the object-glass by that of the eye-glass. The interval between the two glasses, in this case, will be 9 inches, which is the length of the telescope,...
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Elements of natural philosophy

Golding Bird - 1848 - 552 pagine
...by the same means as in the case of compound microscopes. The magnifying power of these telescopes is found by dividing the focal length of the object-glass by that of the eye-glass. 756. If a concave eye-glass be substituted for the lens CD in the last-described instrument, we have...
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Natural philosophy. Treatise 5

Natural philosophy - 1850
...large field and a distinct view. This may therefore be properly called the terrestrial telescope. Its magnifying power is found by dividing the focal length of the object-glass by that of the single lens equivalent to the eye-piece. The magnifying power may be increased by enlarging the distance...
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The Complete Works of Thomas Dick, Volume 3

Thomas Dick - 1850
...and the focus of the eyeglass to be one inch, the magnifying power will be ten times, which is always found by dividing the focal length of the object-glass by that of the eyeglass. The interval between the two glasses, in this case, will be nine inches, which is the length of the...
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The Elements of Natural Philosophy; Or, An Introduction to the Study of the ...

Golding Bird, Charles Brooke - 1867 - 851 pagine
...tlinse employed in the construction of compound microscopes. The magnifying power of these telescopes is found by dividing the focal length of the object-glass by that of the eye-glass. 1170. In the refracting telescope as ordinarily constructed, the erecting glasses are interposed between...
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Optics: Light and Sight Theoretically and Practically Considered, with Their ...

Edward Nugent - 1870 - 268 pagine
...containing the eye-glass which he held in his hand. The magnifying power of the astronomical telescope is found by dividing the focal length of the object-glass by that of the eye-glass. The Galilean Telescope. — This telescope, which was the one used by the illustrious Galileo, from...
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