. The microscope; an introduction to microscopic methods and to histology. Microscopes. 12 GEOMETRICAL CONSTRUCTION OF IMAGES ^ to H I 1 A \ â â â â / < \ â .F Fig. 9. Showing (F). Concave Lens Virtual Focus (2) The obliquity with which the light strikes the second medium. The greater this obliquity the greater the bending of the light, in accordance with the law of sines. (For further discussion see Ch. IX.) § 10. Geometrical construction of im- ages. â In this book the lenses shown are thick, but the course of the rays, for sim- plicity, is shown to be as if the lenses were infinit
. The microscope; an introduction to microscopic methods and to histology. Microscopes. 12 GEOMETRICAL CONSTRUCTION OF IMAGES ^ to H I 1 A \ â â â â / < \ â .F Fig. 9. Showing (F). Concave Lens Virtual Focus (2) The obliquity with which the light strikes the second medium. The greater this obliquity the greater the bending of the light, in accordance with the law of sines. (For further discussion see Ch. IX.) § 10. Geometrical construction of im- ages. â In this book the lenses shown are thick, but the course of the rays, for sim- plicity, is shown to be as if the lenses were infinitely thin, that is, they show all the bending at one plane (the refracting plane, fig. 11-12). In reality there is one refrac- tion at the incident or entering surface and one at the emerging surface. With thick lenses like those figured, there will be no angular deviation for rays traversing the optical center of the lens, but there will be a cer- tain amount of dis- placement, although the emerging ray will remain parallel to the entering or incident ray (fig. si)- For the construction of images it is necessary to know the position of the principal focus and the optical center of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. [Ithaca, N. Y. The Comstock publishing company
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