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Книги Книги 1 - 10 з 26 у Power.—If we use the naked eye, we cannot see the image distinctly from a distance....
" Power.—If we use the naked eye, we cannot see the image distinctly from a distance much less than a foot, but if we use a magnifying lens of, say, one inch focus, we can view it from a distance of only an inch, and it will look correspondingly larger.... "
The Elements of Astronomy: A Textbook - Сторінка 401
автори: Charles Augustus Young - 1897 - 464 стор.
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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...
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Letters of Euler on Different Subjects in Natural Philosophy ..., Том 2

Leonhard Euler, Sir David Brewster, John Griscom - 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: being an experimental introduction to the ...

Golding Bird - 1839 - 407 стор.
...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,...
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The Practical Astronomer: Comprising Illustrations of Light and Colours ...

Thomas Dick - 1845 - 567 стор.
...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...
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The practical astronomer, comprising illustrations of light and colours [&c.].

Thomas Dick - 1845 - 120 стор.
...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...
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Elements of Physics: Imponderable bodies. II. Electricity, electro-magnetism ...

Carl Friedrich Peschel - 1846
...image formed by the object-glass may fall beyond its focal length. — The magnifying power is found by dividing the focal length of the object-glass by that of the eyeglass. Fig. 96. Let Fig. 96. be a representation of the astronomical telescope : ab is the object...
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Elements of natural philosophy

Golding Bird - 1848 - 552 стор.
...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,...
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The complete works of Thomas Dick, Том 3

Thomas Dick - 1850
...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...
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Natural philosophy. Treatise 5

Natural philosophy - 1850
...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 Elements of Natural Philosophy; Or, An Introduction to the Study of the ...

Golding Bird, Charles Brooke - 1867 - 851 стор.
...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...
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