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THREE-DIMENSIONAL MOTION PICTURES speed is lessened. When the light energy meets an obstacle in its path, similar phenomena happen and the study of these phenomena and the laws governing them are part of that branch of physical science called optics. LIGHT RAYS AH luminous bodies create the energy called light and this energy has been shown to be propagated in all directions. It is quite evident that this energy presents the same properties at every point where it is propagated. The light energy emitted by an electric bulb placed in the center of a room has the same characteristics in all corners of the room and if it is desired to learn some of the intrinsic properties, it will be sufficient to in vestigate them at any one point of the room. It was thus found necessary to establish a minimum entity of light energy, the knowledge acquired on its behavior standing good for all other similar entities of the same source of light. As light is propagated in a straight line we can imagine one definite point of the luminous body creating the light energy and from this point the portion of this energy which reaches another point at any distance from it. This quantity of light energy receives the name of ray. A ray of light is then an imponderable entity of light repre senting the direction in which light is propagated. When the light of the sun is permitted to pass through a small orifice drilled in the wall of a dark chamber and the chamber is filled with a thin cloud of smoke a streak of light is made visible which is commonly called a ray. This streak, in fact, no matter how small the orifice may be, is composed of an infinite number of rays. Such an agglomeration of light rays is called a beam or pencil of light. The path of a ray of light in any substance can be followed with great precision and a visual representation of it can be drawn on paper.