Gilbert light experiments for boys . Fig. 163, Parallel waves and rays are diverged GILBERT LIGHT EXPERIMENTS 107 at a distance greaterthan the focal length. If the light is atthe focus (2, Fig. 164),the curvature of thewaves is so alteredthat they are parallelafter they passthrough the lens. If the light isnearer to the lens thanthe focus (3, Fig. 164),the curvature of thewaves is altered bythe lens, but they stilldiverge and will Fig. 164. Light and a converging lens FUN BY DAY OR NIGHTExperiment No. 105. Images. Arrange a candle, 4-inch con-verging lens, and screen as in Fig
Gilbert light experiments for boys . Fig. 163, Parallel waves and rays are diverged GILBERT LIGHT EXPERIMENTS 107 at a distance greaterthan the focal length. If the light is atthe focus (2, Fig. 164),the curvature of thewaves is so alteredthat they are parallelafter they passthrough the lens. If the light isnearer to the lens thanthe focus (3, Fig. 164),the curvature of thewaves is altered bythe lens, but they stilldiverge and will Fig. 164. Light and a converging lens FUN BY DAY OR NIGHTExperiment No. 105. Images. Arrange a candle, 4-inch con-verging lens, and screen as in Fig. 165. Place the lighted candle 3 feet from the lensand move the screenuntil you get an it inverted andsmall ? Repeat withcandle at 2 feet and 1foot. Is the imagelarger each time? Place candle attwice the focal length,that is, 8 inches. AreFig. 165. You see a picture of the candle image and candle the
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