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A perfect reflecting diffuser is

  • A.a theoretical surface reflecting all light diffusely
  • B.the white calibration tile supplied with every instrument
  • C.a mirror reflecting all light specularly
  • D.a black trap absorbing all incident light

Answer: A

It has a reflectance of one at every wavelength and scatters perfectly. Real tiles are calibrated against it rather than being it themselves. It is a theoretical construct rather than an object. Real tiles approximate it to a stated uncertainty.

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