Astronomy for schools; upon the basis of Mons. Arago's lectures at the Royal observatory of Paris .. (1841)
Arago, F. (François), 1786-1853, Haskins, Roswell William, [from old catalog] ed · New York, Robinson, Pratt & co.; · leaf 28
and the other divergent lenses,or glasses. It is easy to see how such glasses would assistvision, by correcting the too strong or too feeble con-vergence of rays for the eyes of persons that are de-fectively long or short sighted; but our object does notrequire us to dwell upon this point * Lens,… … Suppose an assemblage of parallel rays to fall upona convex lens, that we may examine more closely thisphenomenon. Among the incident rays, S, fig. 11,there is one which coincides with theaxis of the lens, and therefore traver-ses it without refraction. But with theremaining rays this is not so.…
Astronomy
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