In an experiment in color matching, an observer is shown two patches of light. One is called the test patch, and the other is called the comparison patch. The test patch is a single wavelength of an unchanging illumination or brightness. The comparison patch is composed of three primary colors, such as the red, green, and blue used in a television. The observer has control over the intensities of the three lights in the comparison patch. The observer should be able to ______.
A. control the colors so that they simulate real colors in the world
B. control the comparison patch so that it looks identical to the test patch in color
C. alter the comparison patch until it is a heterochromatic color
D. alter the comparison patch until it is a spectral color
Answer: B
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