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Three of the following are optical or retinal factors affecting an individual's colour vision. Which is the odd one out?

  • A.the density of the macular pigment present
  • B.the degree of yellowing present in the crystalline lens
  • C.the relative numbers of the three cone types
  • D.how much light the sample reflects at each wavelength

Answer: D

Sample reflectance is a property of the object rather than of the observer. The other three are all individual characteristics of the eye itself. Reflectance belongs to the sample instead. Only the first three describe the observer.

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