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)
to the other, the tirst willinsensibly fade away, whilst the other as insensibly grows brighter. Inthis manner all the effects, intermediate between full daylight and fullmoonlight, may be obtained in succession. ^81. Figure 19.—Opera-glasses.—The opera-glass consists es-sentially of a convex… … The object-glass, X, converges the rays coming from the object A,npon the concave eye-glass, L, by which the converging rays are ren-dered slightly divergent before entering the eye, as though emanatingfrom the position T, at a distance of distinct vision; the image beingvirtual and erect. The…
Physics · Astronomy
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