The microscope; an introduction to microscopic methods and to histology (1901)
Gage, Simon Henry, 1851-1944 · Ithaca, N.Y. Comstock publishing company · leaf 16
ept theprincipal axis, is a secondary axis ; and every secondary axis is more or lessoblique to the principal axis. In Fig. 14, line (2), is a secondary axis, and in Fig.15, line (1). See also Fig. 58. Figs. 10, 11.—Sectional views of aconcave or diverging and a convex orconverging lens to show… … \ 6. Principal Focus.—This is the point where rays parallel with the axis andtraversing the lens cross the axis ; and the distance from the focus to the center ofthe lens measured along the axis is the Principal Focal Distance. In the diagrams,Fig. 10 is seen to be a diverging lens and the rays…
Microscopy
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