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ARLIIL AL wwaua Awsnaasn, | B, 1 Color Addition and Subtraction Read from Lesson 2 of the Light Waves and Color chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/light/u1212d.html http://www.physicsclassroom.com/Class/light/u1212e.html MOP Connection: Light and Color: sublevels 3 and 4 1. White light is observed when light of wavelengths strike the retina. 2. Primary colors of light are three colors of light which when mixed together produce white light. There are many different sets of primary light colors. Interestingly enough, the eye contains three types of color sensors (nerve cells) that sense the entire span of the visible light spectrum. Each of the three types of cells senses a range of colors; yet they are most sensitive to a specific light color. The most common set of three primary light colors are those that correspond to the three colors that the nerve cells are most sensitive to. What are these three primary colors? 3. By combining pairs of these three primary colors in equal intensity, one can produce the secondary colors of light. State the pairs and the secondary colors they produce. Then fill in the color wheel to the right. KCd\ & fi'uf‘ make MQ@Q!'R (reen o« Blue mue_ (Yan . ) ;5 _KfiL&_(zmm_make_{Zlm Green Blue 4. Two lights are arranged above a white sheet of paper. When the 6 é lights are turned on they illuminate the entire sheet of paper (as K xte o seen in the diagram at the right). Each light bulb emits a primary color of light - red (R), green (G), and blue (B). Depending on which primary color of light is used, the paper will appear a different color. Express your understanding of color addition by determining the color that the sheet of paper will appear in the diagrams below. R G Paper appears Paper appears Paper appears © The Physics Classroom, 2009 Page 7