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The eye's spectral sensitivity peaks in the photopic regime at approximately

  • A.555 nanometres in the yellow green
  • B.450 nanometres in the blue
  • C.650 nanometres in the red
  • D.507 nanometres in the blue green region

Answer: A

The photopic luminous efficiency function peaks there and falls away either side. The scotopic peak sits near 507 nanometres, which is the origin of the Purkinje shift. Photopic and scotopic peaks differ by about fifty nanometres.

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