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The scotopic luminous efficiency function peaks at approximately

  • A.400 nanometres
  • B.507 nanometres
  • C.555 nanometres
  • D.650 nanometres

Answer: B

Rod vision peaks at a shorter wavelength than cone vision does. The difference between the two peaks produces the Purkinje shift at twilight levels. Rods peak at a shorter wavelength than cones. The two peaks differ by about fifty nanometres.

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