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)
, be placed before a large double convex lens, L, animage of the object will be formed at the conjugate focus, which maybe received on a plate of ground glass, P. From the image, rays oflight will diverge, as from a real object, which will be seen whereverthe eyes may be placed, within the cone of… … screen of ground glass, P. Though the two pictures have their imagessuperimposed on the same part of the screen, P, yet each picture canbe seen only by the rays emanating from the photograph by Avhich itwas formed. If the eyes be placed, as figured, so that rays coming from one lenswill enter the…
Physics · Astronomy
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