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Measurement area size matters because

  • A.a large area reduces the accuracy of the wavelength scale
  • B.the observer functions apply to a single field size only
  • C.the illuminant changes with the area measured
  • D.a small area may not average out the texture of the sample

Answer: D

A textured or printed sample requires a large enough aperture to average properly. Small apertures are used where only a small uniform area is available. Texture needs a large aperture to average. Small apertures suit small uniform areas.

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