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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... "
The examinations for the degree of bachelor of arts, Jan., 1847 - Σελίδα 5
των Cambridge univ, exam. papers - 1847 - 80 σελίδες
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Hand-books of Natural Philosophy and Astronomy, Τόμος 3

Dionysius Lardner - 1854
...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...

Hand-book of Natural Philosophy and Astronomy: 3d Course. Meteorology ...

Dionysius Lardner - 1853 - 852 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...

Hand-books of Natural Philosophy and Astronomy, Τόμος 3

Dionysius Lardner - 1858
...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...

Handbook of astronomy

Dionysius Lardner - 1860
...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...

Light: An Elementary Textbook, Theoretical and Practical for Colleges and ...

Sir Richard Glazebrook - 1894 - 213 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...

Heat and Light: An Elementary Text-book Theoretical and Practical

Sir Richard Glazebrook - 1894 - 434 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...

Heat and Light an Elementary Text Book Theoretical and Practical ...

Sir Richard Tetley Glazebrook - 1894 - 207 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...

Light: An Elementary Text-book, Theoretical and Practical for Colleges and ...

Sir Richard Glazebrook - 1902 - 213 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...

Introduction to Physical Science

Alfred Payson Gage - 1902 - 359 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...

Text-book of General Physics for High Schools and Colleges

Joseph Sweetman Ames - 1904 - 768 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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