. The microscope and its revelations. Pin. (,. Convex and concave FIG. 7.—Proof that a lens maybe considered lenses are related to the as an assemblage of prisms. (From tin I rism. • Fun-rs ui Nature.) shaded parts its relation to a pair of prisms. The fact that a lens effect, as such, but an assemblage of superposed prisms is seen infig. 7, the refracting angle of the prism being more acute as theprincipal axis is approached, and the deviation being greater as theangle is more obtuse. In fig. 8 letOP be the axis in each case; then, from \\hai wehave seen, it is manifest that rays parall
. The microscope and its revelations. Pin. (,. Convex and concave FIG. 7.—Proof that a lens maybe considered lenses are related to the as an assemblage of prisms. (From tin I rism. • Fun-rs ui Nature.) shaded parts its relation to a pair of prisms. The fact that a lens effect, as such, but an assemblage of superposed prisms is seen infig. 7, the refracting angle of the prism being more acute as theprincipal axis is approached, and the deviation being greater as theangle is more obtuse. In fig. 8 letOP be the axis in each case; then, from \\hai wehave seen, it is manifest that rays parallel to the axis falling on theprisms with their bases in contact and acting like a convex lens willbe refracted towards the axis U P. Hut in the other case, uherethe prisms have their apices together, as in lig. !», act in- as a concave lens, the light is refracted away from the axis P. ACTION OF A PAIR OF PRISMS I I V R H. FIG. 8.—Action of a pair of prisms with their bases in contact on parallel light.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
