Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 180
angent to the edges of objects which cast them. § 8. Any line H i?, whichpierces the wave surface perpen-dicularly, is called a ray of light.A 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… … Uay of light.
Mechanics · Acoustics · Optics
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
