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)
are not exactly alike (469), and by thedifference in the images we are aided in judging of the distance andfigure of the object (466). The nearer the object the greater isthis difference. If the object is very distant the images will be sensiblyidentical, and we lose the aid just mentioned, in… … as would be obtained if the distance between the eyes were greatly in-creased, which increases the difference in the images on the two retinae,and gives the same appearance of relief to the object as if it werebrought near to the observer. Let AB, rays of light coming from some distant object, fall…
Physics · Astronomy
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