Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 292
nes the magnifying power of the telescope. Ifnearly flat, the image is seen almost of its real size; ifmore convex, the rays enter the eye so as to make alarger angle with one another, and the image is muchmagnified. Fig. 79 gives the course of rays through a refractingtelescope. It will be seen… … Fig. 78.—Portable Newtonian Reflector. but when terrestrial objects are to be observed it isnecessary to add two more lenses to turn them over 288 ASTRONOMY. again. This is the only difference between an astro-nomical telescope and a common spy-glass. i 1 iB A Fig. 79.—Illustration of the Principle…
Astronomy
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