The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 * Chap, xxiv.] THE REFLECTION OF LIGHT. 301 the image; because the more limited the extent of surface illuminated by the separate rays, the less ten- dency there is to overlapping. The intensity of light varies inversely as the square of the distance from the source of light. Fig. 127.—Reflection of Light. REFLECTION OF LIGHT. 'When a ray of light falls upon a polished surf
The elements of physiological physics The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology elementsofphysio00mgre Year: 1884 * Chap, xxiv.] THE REFLECTION OF LIGHT. 301 the image; because the more limited the extent of surface illuminated by the separate rays, the less ten- dency there is to overlapping. The intensity of light varies inversely as the square of the distance from the source of light. Fig. 127.—Reflection of Light. REFLECTION OF LIGHT. 'When a ray of light falls upon a polished surface, it is reflected in a definite direction. Let CD (Fig. 127) be a polished surface on which a ray of light AB falls, the ray will be re- flected from the surface in the direction BE. AB is called the incident, and BE the reflected ray. Let a line FB be dropped per- pendicular to the surface ; this line is called the normal to the surface. The point B where the ray falls is the point of incidence, and the angle ABF (the angle a), made by the incident ray and the normal, is the angle of incidence, while the angle EBF (angle b), made by the reflected ray and the normal, is the angle of reflection. Now it is found that these two angles are equal to one another and are in the same plane. Thus the two laws of re- flection of light are : (1) the angle of incidence is equal to the angle of re/lection; and (2) the incident and re- flected rays are in the same plane. The application of these rules explains the formation of images of ob- jects by mirrors. Mirrors may be plane or curved. Plane mirror*.—Let PP' be a plane mirror (Fig. 128); and suppose AB to be an arrow placed in front of it. Consider rays of light falling from the point A of the arrow, and meeting the mirror;
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