54 shoAvs a sim-ple diagram of a telescope. The object viewed is supposed to bean arrow, very far away, but so large that in spite of distanceit covers an angle of a degree or so. If this conception seemstoo artificial, we may think of the point of the arrow as repre-senting one star, the butt… … A real inverted image of the object is formed in the focalplane of the objective, from which the waves continue on,diverging from this image exactly as if it were a materialobject, except that the light is limited to a comparatively smallcone. This light falls upon the eyepiece, which forms with…
Light
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
