To view this page ensure that Adobe Flash Player version 11.1.0 or greater is installed.

DOUBLE TAP TO ZOOM WITH PHONE OR TABLET or green bulbs are substituted for the clear flashlight bulbs. A cardboard box creates the darkened area needed for children to observe the effects of mixing colored lights. A piece of white paper mounted in the back of the box provides a colorless surface for the experiment. Red, blue, green, yellow, cyan, and magenta color tiles, made by clipping the appropriate colors from free paint-sample cards, mounting them to note cards, and printing the name of the color on the card, are also included in the center. Children can use the tiles to show the results of mixing the colored lights. Children can record their observations on documen- tation sheets. Science Content Comments and Questions to Support Inquiry • What color of light do you see when you mix the red and green lights? Does that happen when you mix red and green paint? Let’s write down that red and green light make yellow, and later we’ll try mix- ing red and green paint. • If you work together, you can combine three col- ors of light. Let’s see what happens. • How would you describe the color of light you made by combining green and blue? That color is called cyan. Misconception Alert When colors that are emitted directly from a light source are combined, new colors are produced by an additive process. This is different from the subtractive process that is involved when colored pigments, such as paint or colored water, are combined (see Activity 4.11). Red and green lights combine to produce yel- low; green and blue lights produce cyan; and red and blue lights produce magenta. Red, green, and blue lights produce white when all three are combined. When mixing colored lights, the primary colors are red, blue, and green. This is different from the primary colors for mixing pigments, which earlier color theory identified as red, blue, and yellow and are now known to be magenta, cyan, and yellow. Mathematics Content The mathematics content in this center involves comparing the results of mixing two primary colors of light, which produce a secondary color, with combin- ing three colors of light, which produces white. COPYRIGHTED MATERIAL ST E M lE aR n I ng c E n T E R S 19