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A non-spectral colour is one that

  • A.appears only under an artificial light source
  • B.lies outside the range of human vision entirely
  • C.cannot be produced by light of any single wavelength
  • D.can be produced by light of a single wavelength only

Answer: C

Magenta and purple are the familiar examples, requiring both long and short wavelengths together. They occupy the straight line closing the chromaticity diagram between the spectral extremes. The purple line closes the horseshoe shape.

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