Laurence, Lionel · London, School of Optics · leaf 350
n the screen, and mark P2 (Fig. 355);repeat the process on the other side and similarly mark Fv Then place thecross-wires at a convenient distance^ and its image is at/2; measure F^^Bai&o f1F1=A, then F=\/AB. This should be checked by finding a second pair of conjugates A and B. Laurances… … Fig. 356. wires in front of the lens until its image is sharply focussed on the screen atf2 and mark its position P. Again withdraw the screen to/2, which is exactlyone (or more) inches farther back, so that it is now n inches from F; shiftthe wires toP until the image is again in focus at//.…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
