 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 401автори: Charles Augustus Young - 1897 - 464 стор.Повний перегляд - Докладніше про цю книгу
 | William Kitchiner - 1825 - 480 стор.
...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... | |
 | Leonhard Euler, Sir David Brewster - 1833 - 446 стор.
...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... | |
 | Golding Bird - 1839 - 458 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,... | |
 | Thomas Dick - 1845 - 644 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... | |
 | Thomas Dick - 1845 - 608 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... | |
 | Carl Friedrich Peschel - 1846 - 188 стор.
...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... | |
 | Golding Bird - 1848 - 620 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,... | |
 | Thomas Dick - 1850 - 586 стор.
...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... | |
 | Natural philosophy - 1850 - 124 стор.
...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... | |
 | Golding Bird, Charles Brooke - 1867 - 894 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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