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The reference white for a reflectance measurement is conventionally

  • A.the brightest sample in the current batch
  • B.the internal coating of the integrating sphere
  • C.a calibrated white tile traceable to a national standard
  • D.a sheet of ordinary white office paper

Answer: C

Its reflectance values are certified against a perfect reflecting diffuser. The tile itself must be kept clean and recalibrated periodically. Values are certified against a perfect diffuser. Traceability runs back to a national standard.

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