. The elements of vegetable histology. Plant anatomy. THE MICROSCOPE 25 perpendicular to the surface of the medium of lesser density (Fig. 8). Glass being of greater density than air, light rays passing through it will be bent toward a line at right angles to its surface. Six different types of lenses are formed by com- binations of curved surfaces, either with each other. Fig. 8.—Refraction of Light Rays. 1. Path of ray passing from less dense medium (.A) to one of greater density (B). 2. Path of ray passing from medium of greater density (4) to one of less density (B). or with flat or plane
. The elements of vegetable histology. Plant anatomy. THE MICROSCOPE 25 perpendicular to the surface of the medium of lesser density (Fig. 8). Glass being of greater density than air, light rays passing through it will be bent toward a line at right angles to its surface. Six different types of lenses are formed by com- binations of curved surfaces, either with each other. Fig. 8.—Refraction of Light Rays. 1. Path of ray passing from less dense medium (.A) to one of greater density (B). 2. Path of ray passing from medium of greater density (4) to one of less density (B). or with flat or plane faces. A lens similar to an ordi- nary magnifying glass is termed convex or double convex. If the lens is thinnest at the center it is termed con- cave or double concave. Two variations of convex lenses are recognized, plano-convex and concavo-convex or convergent meniscus. Similarly there are two variations of concave lenses, plano-concave and convexo-. 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 Ballard, Charles William, 1887-. New York, John Wiley & Sons, Inc. ; [etc. ,etc. ]
Size: 1583px × 1579px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantanatomy, bookyea
