Which color is the complementary to cyan light?

• A. Blue
• B. Green
• C. Red
• D. Magenta

Answer: (C)

In light, complementary colors are pairs that add up to white. Cyan is created by combining blue and green. The color that completes the set to white when paired with cyan is red, because red is the remaining primary color in additive mixing. Blue or green alone aren’t complements because they’re components of cyan, not opposites. Magenta is red+blue and doesn’t oppose cyan. So red is the color that is complementary to cyan light.