 | Dionysius Lardner - 1854 - 870 σελίδες
...and by the imperfect transparency of their material. The increase of the visual angle is determined by the ratio of the focal length of the object glass to that of the eye glass (1212), and the increase of illumination is determined by the ratio of the area of the aperture of... | |
 | Dionysius Lardner - 1853 - 960 σελίδες
...and by the imperfect transparency of their material. The increase of the visual angle is determined by the ratio of the focal length of the object glass to that of the eye glass (1212.), and the increase of illumination is determined by the ratio of the area of the aperture of... | |
 | Dionysius Lardner - 1858 - 912 σελίδες
...and by the imperfect transparency of their material. The increase of the visual angle is determined by the ratio of the focal length of the object glass to that of the eye glass (1212), and the increase of illumination is determined by the ratio of the area of the aperture of... | |
 | Dionysius Lardner - 1860 - 614 σελίδες
...and by the imperfect transparency of their material. The increase of the visual angle is determined by the ratio of the focal length of the object glass to that of the eye glass (O. 5 1 o), and the increase of illumination is determined by the ratio of the area of the aperture... | |
 | Sir Richard Glazebrook - 1894 - 292 σελίδες
...which consist of two such telescopes, one for each eye. Its magnification is, it may be shewn, measured by the ratio of the focal length of the object glass to that of the eyepiece. Since the distance between the lenses is the difference between their focal lengths instead... | |
 | Sir Richard Glazebrook - 1894 - 236 σελίδες
...which consist of two such telescopes, one for each eye. Its magnification is, it may be shewn, measured by the ratio of the focal length of the object glass to that of the eyepiece. Since the distance between the lenses is the difference between their focal lengths instead... | |
 | Sir Richard Tetley Glazebrook - 1894 - 482 σελίδες
...which consist of two such telescopes, one for each eye. Its magnification is, it may be shewn, measured by the ratio of the focal length of the object glass to that of the eyepiece. Since the distance between the lenses is the difference between their focal lengths instead... | |
 | Sir Richard Glazebrook - 1902 - 236 σελίδες
...which consist of two such telescopes, one for each eye. Its magnification is, it may be shewn, measured by the ratio of the focal length of the object glass to that of the eyepiece. Since the distance between the lenses is the difference between their focal lengths instead... | |
 | Alfred Payson Gage - 1902 - 394 σελίδες
...distant object formed by the object glass. The magnifying power of this instrument is approximately the ratio of the focal length of the object glass to that of the eyeglass. Increasing the diameter of the object glass, if the focal length be not changed, does not... | |
 | Joseph Ames - 1904 - 782 σελίδες
...image formed at an infinite distance by the eyepiece. reflecting instrument (see page 499), equal to the ratio of the focal length of the object glass to that of the eyepiece. The resolving power of a telescope is, as we have seen, determined by the size of the object... | |
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... pencil parallel to ap and capable of producing normal vision in an eye placed to receive them. The image seen is magnified and erect. This arrangement of lenses is used in opera and field glasses, which consist of two such telescopes, one for each... 
