Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 327
ocal distance of parallel rays falling upon a convex lens is repre-sented at A, Fig. 261. If the rays are converging, as at B,-they will cometo a focus sooner, and if diverging, as at C, the focus will be further from tholens than for parallel rays. The focus of a convex lens may be easily found by… … held on the other. A bright ring of light will FiG. 261, be observed on the paper, diminishing or in-creasing in size according to the distance ofthe paper from the glass. If the former is heldin such a manner that the ring of hght is re-duced to a dazzling luminous point, as is rep-resented in…
Physics · Science · Technology
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
