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Additive mixing of two lights always produces a colour that lies

  • A.on the straight line joining them in the chromaticity diagram
  • B.outside the whole region bounded by the two component colours
  • C.at the white point regardless of the components chosen
  • D.on a curved path following the spectrum locus

Answer: A

Correct answer: on the straight line joining them in the chromaticity diagram

Because tristimulus values add, the mixture is a weighted average of its components, and a weighted average of two points lies on the segment between them. The position along the line depends on the relative luminances. This is why the gamut of three primaries is the triangle they define.

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