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The wavelength range of a colour measuring spectrophotometer typically covers

  • A.about 200 to 300 nanometres only
  • B.about 700 to 1400 nanometres only
  • C.the whole of the electromagnetic spectrum
  • D.about 400 to 700 nanometres at minimum

Answer: D

Instruments measuring fluorescent samples extend further into the ultraviolet. The visible range is the minimum required for tristimulus calculation. Fluorescent work extends into the ultraviolet. The visible alone suffices for ordinary samples.

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