Gilbert light experiments for boys . t in a good lightand look at itthrough the prism(Fig. 147). Do youfind a spectrum in-stead of the whitepaper? Do you find alsothat the spectrum isreversed, that is,that the red is nearest the base of the prism and the violetnearest the angle? This is so because your eye sees an objectin the direction the light enters it from the object. The redis least bent but appears to be most bent, and the violet thereverse. Experiment No. 91. Combining spectra. Cut a strip ofwhite paper 1 inch wide and 2 inches long and look at it throughthe prism (Fig. 148). Do the ed
Gilbert light experiments for boys . t in a good lightand look at itthrough the prism(Fig. 147). Do youfind a spectrum in-stead of the whitepaper? Do you find alsothat the spectrum isreversed, that is,that the red is nearest the base of the prism and the violetnearest the angle? This is so because your eye sees an objectin the direction the light enters it from the object. The redis least bent but appears to be most bent, and the violet thereverse. Experiment No. 91. Combining spectra. Cut a strip ofwhite paper 1 inch wide and 2 inches long and look at it throughthe prism (Fig. 148). Do the edges appear colored, but is thecenter white? The center is white because the spectra formedby the edges overlap at the center and this combination of all thecolors of the spectrum produces white light. ExperimentNo. 92. Colored can-dle, flame. Look atthe flame of a candlethrough a it beautifully col-ored, but doesthe center tend tobe white and are thecolors reversed as above ? j?ig. 148. The paper is colored only at the edge. GILBERT LIGHT EXPERIMENTS 97 COMPLEMENTARY COLORS Complementary colors are those which, when combined, pro-duce white light. If any colors are taken out of the spectrum,the remaining colors are complementary to those taken out,because together they produce white light. MIXING PAINTS A paint which absorbs the colors in the blue end of the spec-trum is red in color and a paint which absorbs the colors inthe red end of the spectrum is blue in color. If, now, thesepaints are mixed, they do not produce white paint but blackpaint because together they absorb all the colors. FUN WITH SUNLIGHTExperiment No. 93. Colored glasses. Stand the red andblue glasses side by side on a piece of white paper in red absorbs the blue end of the spectrum and lets throughred light. The blue absorbs the red end of the spectrum andlets through blue light. Now place one behind the other. Dothey absorb all the light and is the shadow black? THE RAINBOW The rainbow
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