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Colour measurement instruments typically report reflectance at intervals of

  • A.10 nanometres
  • B.100 nanometres
  • C.1 micrometre
  • D.0.1 nanometres

Answer: A

Ten and twenty nanometre intervals are both common in industrial instruments. Finer intervals bring little benefit for smooth reflectance curves. Ten and twenty nanometre intervals are both common. Either suffices for a smooth curve.

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