Laurence, Lionel · London, School of Optics · leaf 326
ication of the prism binocular,but for all-round use the best M is 6 or 8 times; if higher, it has to be heldvery firmly indeed to prevent unsteadiness of the image, while if only a lowmagnification is required the Galilean is perhaps to be preferred. The instrument is compact, easily made in… … Fig. 326. The Galilean Telescope or Opera-Glass consists of a Cx. lens, L (Fig. 326),placed in front of a Cc, E, of higher power, at a distance equal to the alge-braical sum of their focal lengths, so that the lenses neutralise each otherby separation. Although the rays of each pencil from a…
Optics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
