Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 437
marine glasses. As shown in Fig. 301 an erect virtual image isformed, the magnification being M ^/,//, (§477)- The tube has a lengthapproximately equal to the difference between the focal lengths of theobjective and the eyepiece, while in the ordinary telescope the length is thesum of these… … some than vi^ith refractors. As the real image is formed alongthe axis of the mirror and in the path of the incident light,special devices are necessary in order to view it. In the New-tonian telescope the image is reflected to one side by a small right-angled prism which cuts off very little…
Physics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
