. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. 852 PHYSIOLOGY OF THE DOMESTIC ANIMALS. By the term " refractive index " is meant the number which shows how many times the sine of the angle of incidence (a b, in Fig. 3T0, regarding S D as the incident ray) is greater than the sine of the angle of refraction (e d), it being always assumed that in comparing the refractive indices'of two media the incident ray passes from air into the medium. On passing from air into water the ray is
. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. 852 PHYSIOLOGY OF THE DOMESTIC ANIMALS. By the term " refractive index " is meant the number which shows how many times the sine of the angle of incidence (a b, in Fig. 3T0, regarding S D as the incident ray) is greater than the sine of the angle of refraction (e d), it being always assumed that in comparing the refractive indices'of two media the incident ray passes from air into the medium. On passing from air into water the ray is so refracted that the sine of the angle of incidence is to the sine of the angle of refraction as 4:3; with glass, the proportion is 3 : Fig. -DlAGRAM ILLUSTRATING THE COMPOSITION OF A CONVEX LENS OF a Number of Plane Surfaces. (Gemot.) iry serves greatly to simplify the conception of refraction. It has been stated that in passing from a rarer to a denser medium the luminous ray is bent toward the perpendicular. If a line of men, as of soldiers, be marching obliquely toward the edge of a plowed field, the men first reaching the uneven ground will experience difficulty in walking over the rough surface and their end of the line will move more slowly than the end still remaining on the level ground, and, as a conse- quence, the entire direction of the line of men will be "changed. On the other. 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 Smith, Robert Meade, 1854-. Philadelphia and London, F. A. Davis
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiol, bookyear1890
