Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 262
, therefore, be neces-sary, which would be inconvenient. For this reason, itis usual to leave the distance between the lenses unal-tered and to vary only the distance of the object to suitdistinct vision. It is, however, convenient to have thepower of changing the distance between the glasses, asby… … Reflectingtelescope; § 82. If the field lens of the astronomical telescope bereplaced by a field reflector IIN, whose optical centreis at (7, as indicated in the figure, we have the commonastronomical reflecting telescope. C being the opticalcentre, d becomes equal to/ - {F„\ and Equation…
Mechanics · Acoustics · Optics
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