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The dominant wavelength of a sample changes if

  • A.the sample is measured with a different instrument
  • B.the observer is asked to name the colour differently
  • C.the sample is illuminated more brightly
  • D.the reference white point used is changed

Answer: D

The construction depends on drawing a line from the white point outward. A different white gives a different intersection with the locus. The construction begins at the white point. A different white gives a different result.

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