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Discussion

The ultraviolet filter of an instrument is calibrated against

  • A.the internal coating of the integrating sphere
  • B.a non-fluorescent white ceramic tile
  • C.a fluorescent reference standard of known whiteness
  • D.the black trap supplied with the instrument

Answer: C

Only a fluorescent standard responds to the ultraviolet setting at all. A non-fluorescent tile would give the same reading whatever the filter position. Only fluorescence responds to the setting. A plain tile reads the same throughout.

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