Photographic optics and colour photography : including the camera, kinematograph, optical lantern, and the theory and practice of image formation (1909)
Johnson, G. Lindsay (George Lindsay), 1853-1943 · New York : D. Van Nostrand Co. · leaf 82
no matter how many lenses and refracting surfaces intervene, provided all the lenses are optically centred on a common axis. The interval between Ex and E2 (or Px and P,) is known as the optical interval or equivalent thickness of the lens, while the distance between F, and E1; and F„ and E2 denote… … Fig. 46. — Graphic construction showing how a negative image is produced by a thick lens. the distances between Fx and the front lens, and F2 and the back lens are never the same, although the distances EjF, and E,,Fo, which are the true focal lengths, are invariably equal. When the position of the…
Photographic optics · Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
