Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 87
object. In reilecting telescopes (reflectors) theobjective is a mirror of speculum metal or silvered glassground to the shape of a paraboloid. The figure showsthe action of such a mirroi on a bundle of parallel rays,which, after impinging on it, are brought by reflection toone focus ^. The image… … Pig. 24.concave mirror forming an image. have to be placed to the right of the point F, and theobservers head would thus interfere with the incidentlight. Various devices have been proposed to remedy thisinconvenience, of which we will describe the two mostcommon. The Newtonian Telescope.—In this…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
