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)
in which case the divergent rays from theobject Avill be made to pass to the eye as parallel rays, and the objectwill appear as large as if the eye were placed at the optical centre of thelens, as shown by Fig. 12 (454). If the focal distance be half an inch, the magnifying power will be10 ^ ^ =… … The object. A. is placed a little beyond the principal focus of theobject-glass L. This lens produces a real image, N, which is inverted.The eye-piece or lens, F, is so placed that its principal focns is a littleheyond the image N. This then acts as a simple microscope and mag-nifies the image;…
Physics · Astronomy
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