Laurence, Lionel · London, School of Optics · leaf 351
Fig. 357. Fro. 358. Dallmeyers Method for a Negative Thick Lens.—Take an achromaticpositive lens and focus the image of the cross-wires on a screen; measure thesize of the image formed and let it be m (Fig. 359). Place the negative lens, … Fig. 359. whose focus is to be found, a short distance within the convergent beam ofthe positive lens, i.e. between it and the screen. Focus tin image formedby the combination and measure its distance D from the back surface orflange of the negative lens; measure the size mx of the image f »rmed.…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
