Gilbert light experiments for boys . Fig. 16. The lens produces a converging pencil and a diverging pencilW = waves. R = rays its light waves after equal intervals of time, but the light wavesare spherical instead of circular. The straight arrows drawn fromthe center represent light rays. They give the path along whichthe light is traveling in all directions from the center. The lightwaves are real and produce the sensation of sight; the rays are notreal, they are imaginary, straight lines which give the directionof the light and they are always at right angles to the waves. Parallel Waves and
Gilbert light experiments for boys . Fig. 16. The lens produces a converging pencil and a diverging pencilW = waves. R = rays its light waves after equal intervals of time, but the light wavesare spherical instead of circular. The straight arrows drawn fromthe center represent light rays. They give the path along whichthe light is traveling in all directions from the center. The lightwaves are real and produce the sensation of sight; the rays are notreal, they are imaginary, straight lines which give the directionof the light and they are always at right angles to the waves. Parallel Waves and Rays. The waves from the dot are largerthe farther they are from the center, and when they are one hun-dred yards or a mile from the center they are very large your eye receives light from any such distant point the smallpart of the waves which enter it are nearly parallel straight lines, GILBERT LIGHT EXPERIMENTS 15. and since the rays are always at rightangles to the waves they are also nearlyparallel. This is particularly true if thedistant point is the sun, at a distance ofninety million miles. Parallel waves andrays then are those from a distant Pencil. A beam (Fig. 15) is a group of parallel waves and rays. A Fig. 17. The candle sends rays •1 /t-« - n\ • r 1 in all directions pencil (Fig. 16) IS a group Of waves and From Appletons School Phys-, . , . , ics. published by the American rays which converge at a point or diverge Book Co. from it. The eyes (Fig. 17) are receiving diverging pencils of light from the candle which is sending out light in all directions. Luminous and Non-luminous Bodies. Luminous bodies arethose which give out light, such as the sun, electric light, gas jet,oil lamp, candle, and match. Non-luminous bodies are thosewhich do not give out light, and which can be seen only bymeans of light from luminous bodies. Transparent, Translucent, and Opaque Bodies.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation
