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Adding red light to green light produces

  • A.brown, as when red and green paints are mixed
  • B.cyan, which is the complement of the mixture
  • C.yellow, since the two spectra combine additively
  • D.black, since the two colours cancel one another

Answer: C

Red and green lights together stimulate the L and M cones much as yellow light does. Mixing red and green paint gives a dull brown instead, since that is a subtractive process. The two processes obey quite different rules.

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