Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 375
-as the focal length. Hence the greater the focal length of theobjective the larger will be the image produced by it. Further, since the celestial bodies (except the sun) are very faint,the diameter of the objective should be large, in order to collect asmuch light from the body as possible. A… … FiG. 435.—The astronomical telescope. tied by the eyepiece F, which forms the image at pq. B is justwithin the principal focus of the eyepiece, and so OE, the distancebetween objective and eyepiece, is approximately equal to F + fthe sura of their focal lengths. The magnification produced by the…
Physics
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