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The luminous efficiency function V lambda describes

  • A.the reflectance of the standard white reference tile
  • B.the relative contribution of each wavelength to brightness
  • C.the relative sensitivity of each cone type to wavelength
  • D.the spectral power distribution of the standard illuminant

Answer: B

It peaks near 555 nanometres and defines the photometric quantities. In the CIE system it corresponds exactly to the y bar colour matching function. Photometric quantities all derive from it. It peaks near 555 nanometres in the yellow green.

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