. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. PiG. 2.— Image formation by a single lens. Note that the image, at the right is % the size of the object, in propoirtion to their respective distances from the lens;, the opening angle being % the size of the closing angle. ture-image distance divided by the object-aperture distance. The sharpness of outline, however, depends now upon the quality of the lens and the accurate adjustment of the distance, and brilliancy is not s
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. PiG. 2.— Image formation by a single lens. Note that the image, at the right is % the size of the object, in propoirtion to their respective distances from the lens;, the opening angle being % the size of the closing angle. ture-image distance divided by the object-aperture distance. The sharpness of outline, however, depends now upon the quality of the lens and the accurate adjustment of the distance, and brilliancy is not seriously impaired in attaining Pig. 3.—Image formation by two lenses in series without magnification. Note that the opening angle of the beam proceeding from the object, at the left, is equal to the closing angle of the beam forming the image at the right. Image formation in the human eye is an example of the work- ing of the lens-armed aperture. The rays of light are brought to a focus on the retina and the image produced here is inverted and actually much smaller than the object, the reduction (minificar tion) being again measured by the quotient of the lens retina distance divided by the object-lens distance. The longer the antero-posterior diameter of the eye, the larger will be the retinal. 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 MacNeal, Ward J. , 1881-1946; Williams, Herbert Upham, 1866-. Philadelphia, P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteri, bookyear1920
