The science and practice of photography : an elementary textbook on the scientific theory and a laboratory manual (1920)
Roebuck, John R. (John Ransom), 1876-1965 · New York ; London : D. Appleton and company · leaf 174
PHOTOGRAPHY 148 They are more useful and accurate than tfie older treatment using the optical center. They have another property, shown in Figs. 24 and 26; it is that planes cutting the axis perpen- … dicularly at the points N and N' are so placed that rays appearing to strike a point in the forward plane, leave the lens as if they came from a point in the rear plane immediately back of the first point. This makes it very simple to follow the actual path of a ray through the lens and therefore
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
