Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 106
toward a window, look intothe smaller tube and move it back and forth in the other till the bestimage of the window or of objects outside is obtained. It is evident at once that the image is upside down, thatis, that the bottom of the image represents the top of theobject. This is due to the fact… … Fig. 58. For instance, the cone of rays A A! from the tip of the arrowand the cone of rays BB from the other end, cross at mn,and appear in the image at the spots A and B respectively.If the aperture mn were gradually made larger, the spotsA! and B\ illuminated from A and B respectively, wouldgrow…
Physics
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
