Which pair of wavelengths corresponds to the peak sensitivities of the scotopic and photopic systems, respectively?

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Multiple Choice

Which pair of wavelengths corresponds to the peak sensitivities of the scotopic and photopic systems, respectively?

Explanation:
Rods drive vision in dim light and are most sensitive to blue-green light around 507 nm. Cones drive vision in brighter light and peak in brightness sensitivity near 555 nm, as captured by the standard photopic luminosity function. So the pair that matches scotopic first and photopic second is 507 nm and 555 nm. The other options mix these peaks or pick wavelengths far from the known maxima for rod- and cone-mediated vision.

Rods drive vision in dim light and are most sensitive to blue-green light around 507 nm. Cones drive vision in brighter light and peak in brightness sensitivity near 555 nm, as captured by the standard photopic luminosity function. So the pair that matches scotopic first and photopic second is 507 nm and 555 nm. The other options mix these peaks or pick wavelengths far from the known maxima for rod- and cone-mediated vision.

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