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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)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 243

An illustration from 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, leaf 243
oint is called thevirtual focus. 236 OPTICS. The parallel rays, S and P, would become divergent, and the converg-ing rays, Y and W, would become less convergent, on ^aassing throughthe lens. Y^^. principal focus, F, is the centre of curvature. Jfl8. Figure 45.—Formation of images by… … from A to the optical centre of the lens. A pencil of rays coming fromB, is deviated, so as to appear to come from the bottom of the object,H, situated on the secondary axis or line drawn from B to the opticalcentre of the lens. Therefore, H is the image of the object, AB. Hence,images formed by…

Physics · Astronomy

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