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 435
combination of lenses is used. An enlarged real image AB(Fig. 298) is formed by an object lens or train of lenses, and28 4i8 LIGHT. … Fig. 299. this image is further enlarged by an eyepiece, such as that of Huy- ghens, used as a simple micro-scope which gives a virtualimage AB. The front lens ofthe objective train is usuallyof the hemispherical form de-scribed in § 448, which has agreat angular aperture, withvery little spherical…
Physics
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