Elements of natural philosophy (Volume 2-3) . terally increased by intercept-ing a portion of the wave. All of which we shall haveoccasion to see fully confirmed by experiment. For thepresent our conclusion is, that in a homogeneous me-dium, the apparent effects of light are propagated fromone point to another in a right line; that the sensibleeffects of light cannot, like those of sound, be propa- ELEMENTS OF OPTICS. 173 gated round corners, and that optic shadows must runL^btnotup to the right line drawn from the luminous source ^^cor!tangent to the edges of objects which cast them. § 8. Any
Elements of natural philosophy (Volume 2-3) . terally increased by intercept-ing a portion of the wave. All of which we shall haveoccasion to see fully confirmed by experiment. For thepresent our conclusion is, that in a homogeneous me-dium, the apparent effects of light are propagated fromone point to another in a right line; that the sensibleeffects of light cannot, like those of sound, be propa- ELEMENTS OF OPTICS. 173 gated round corners, and that optic shadows must runL^btnotup to the right line drawn from the luminous source ^^cor!tangent to the edges of objects which cast them. § 8. Any line H i?, whichpierces the wave surface perpen-dicularly, is called a ray of ray, therefore, is obviously aline along which the successiveeffects of light occur. When the wave surface be-comes a plane, the rays will beparallel, and a collection of suchrays is called a learn of light When the wave surface isspherical, the rays will have acommon point at the centre ofcurvature, and a collection ofsuch rays is called a pencil oflight. Uay of light.
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