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A display produces colour by

  • A.subtractive mixing of cyan, magenta and yellow filters
  • B.reflecting ambient light from coloured surfaces
  • C.absorbing selected wavelengths from a white backlight only
  • D.additive mixing of red, green and blue emitting elements

Answer: D

The three elements are too small to resolve individually at normal viewing distance. Their light adds at the retina to give the perceived colour. Elements are unresolvable at normal distance. Their light adds at the retina instead.

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