Bayley, Roger Child, 1869- · London : Iliffe & Sons · leaf 32
series of prisms such as we have in fig. 6, and one like B (fig. n) from a series such as in fig. 10. If lenses of these two sections respectively were made of the same material, we should find that when we focussed an object at some definite distance from the camera with A and with B respectively,… … A B Fig. ii. — Short and long focus lenses. A would give us a picture on a smaller scale than B. A photographer would describe the difference between them by saying that B was a lens of longer focus than A. In using two such lenses as magnifying glasses, we should find that A magnified more than B.…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
