Which cone photopigment has a maximal absorption wavelength of 557 nm?

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Multiple Choice

Which cone photopigment has a maximal absorption wavelength of 557 nm?

Explanation:
Color vision relies on three cone photopigments that have different peak sensitivities. The long-wavelength pigment, erythrolabe, is most sensitive around 557 nm, placing it in the yellow-green part of the spectrum. This makes erythrolabe the best match for a maximal absorption at 557 nm. The other cone pigments peak at shorter wavelengths (chlorolabe for greener light, cyanolabe for blue) or a separate rod pigment (rhodopsin, peak about 498 nm). So 557 nm aligns with the erythrolabe pigment.

Color vision relies on three cone photopigments that have different peak sensitivities. The long-wavelength pigment, erythrolabe, is most sensitive around 557 nm, placing it in the yellow-green part of the spectrum. This makes erythrolabe the best match for a maximal absorption at 557 nm. The other cone pigments peak at shorter wavelengths (chlorolabe for greener light, cyanolabe for blue) or a separate rod pigment (rhodopsin, peak about 498 nm). So 557 nm aligns with the erythrolabe pigment.

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