A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 640
LILEAN TELESCOPE 615 focal lengths and arc placed at twice their focal length apart, theironly function being to invert the image and so act as erectinglenses. Galilean telescope, or opera-glass. -The pair of erecting lensesC and D in the terrestrial telescope cause loss of light by reflectionat… … Fig. 570.—Two lenses used as a Galilean telescope. The objective O converges the rays towards the point a (Fig. 570);but before they come to a focus, the strong diverging lens E is inter-posed. This causes the rays to diverge, giving a virtual image atab, which will be seen to be erect. The eye…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
