555 nm peak sensitivity corresponds to which visual system?

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Multiple Choice

555 nm peak sensitivity corresponds to which visual system?

Explanation:
Under bright lighting, vision is driven by cones, and the cones’ sensitivity to light across wavelengths reaches its maximum around 555 nm. This peak is captured by the photopic luminous efficiency function, so 555 nm is the defining peak for photopic (cone-mediated) vision. Rods, which support scotopic (low-light) vision, peak at about 507 nm, not 555 nm. Since only cones peak at 555 nm, the correct interpretation is photopic vision. Mesopic conditions involve both but aren’t the focus here.

Under bright lighting, vision is driven by cones, and the cones’ sensitivity to light across wavelengths reaches its maximum around 555 nm. This peak is captured by the photopic luminous efficiency function, so 555 nm is the defining peak for photopic (cone-mediated) vision. Rods, which support scotopic (low-light) vision, peak at about 507 nm, not 555 nm. Since only cones peak at 555 nm, the correct interpretation is photopic vision. Mesopic conditions involve both but aren’t the focus here.

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