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The equal energy illuminant E has chromaticity coordinates of

  • A.one third and one third exactly
  • B.0.3127 and 0.3290 as given
  • C.0.5 and 0.5
  • D.zero and zero

Answer: A

Equal power at every wavelength gives equal tristimulus values by construction. It sits near but not exactly at the centre of the real gamut. Equal power gives equal tristimulus values. It sits near the centre of the diagram.

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