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Two metameric samples must have spectral reflectance curves that

  • A.never cross one another at any point in the spectrum
  • B.coincide exactly at every wavelength measured
  • C.differ by a constant amount at every wavelength
  • D.cross one another at least three times across the spectrum

Answer: D

Three crossovers are the minimum for the three integrals to agree. Fewer crossings would leave one of the tristimulus values unequal. Three integrals must agree simultaneously. Fewer crossings cannot satisfy all three.

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