. The microscope; an introduction to microscopic methods and to histology. Microscopes. 304 APERTURE AND OPACITIES' CCh. IX. Fig. i8o. Effect of Apeetuke on Definite Focus and on Oveecomino OPAaiiES. (From Wright's Principles of Microscopy, p. 77). (i) To show the definiteness of the focus (/) with a large aperture. Either above or below this is a large diffusion circle (a b) due to the size of the section of the aperture. (2) Indefiniteness of the focus due to the fact that a cross section of the aperture considerably above or below the true focus (/), gives so small a diffusion circle (0 or
. The microscope; an introduction to microscopic methods and to histology. Microscopes. 304 APERTURE AND OPACITIES' CCh. IX. Fig. i8o. Effect of Apeetuke on Definite Focus and on Oveecomino OPAaiiES. (From Wright's Principles of Microscopy, p. 77). (i) To show the definiteness of the focus (/) with a large aperture. Either above or below this is a large diffusion circle (a b) due to the size of the section of the aperture. (2) Indefiniteness of the focus due to the fact that a cross section of the aperture considerably above or below the true focus (/), gives so small a diffusion circle (0 or b), that it can hardly be distinguished from the true focus. (3) Low aperture and an opacity in the path of the light. It is so large relatively here that a clear image would be impossible. (4) The same opacity in a larger aperture. is) The same opacity in a still larger aperture. There is now enough of the beam outside the opacity to make the object 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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