Laurence, Lionel · London, School of Optics · leaf 316
w F1=16-66, and«=30 - 16-66=13-33 cm.; F2=25, and Z>=30 - 25=5 cm., so that C=5x 13-33/16-66=4 cm. and C=5x5/25=1 cm. The disc is 4 cm. horizontally and I cm. vertically. It is difficult to showthe two different diameters in one diagram, but a separate one for each clearlyshows the principles… … Fig. 318. To find the circle of least confusion (Fig. 318), as in spherical or chromaticaberration, when Fx and F* are the foci of the periphery and centre, or of the MISCELLANEOUS 305 blue and red light, respectively. The calculation, similar to that on theinterval of Sturm, is as follows:…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
