Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
and on the opposite side of, the lens, real and virtual. Jf IJf- Figure 41 .—Images formed by convex lenses whenthe object is at more and less than tw^ice the focal dis-tance.—1. Let the two dots on the principal axis be the principal OPTICS. 333 foci; and AB, the object, situated more than twice… … 2. If HN be the object, situated between the principal focus andtwice the focal distance, then the image, AB, will be larger than theobject, real, inverted, and situated at more than twice the focal distance. If AB, as an object, be moved toward the lens, the image, HN, willgrow larger and recede…
Physics · Astronomy
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