What is the maximal absorption wavelength of cyanolabe?

What is the maximal absorption wavelength of cyanolabe?

• A. 507 nm
• B. 557 nm
• C. 530 nm
• D. 426 nm

Answer: (D)

Cyanolabe is a short-wavelength cone pigment, tuned to the blue/cyan end of the spectrum. Its peak sensitivity sits around the violet-blue region, typically near 420–430 nm. Among the options, 426 nm is the only value in that short-wavelength range, matching cyanolabe’s blue-sensitive character. The other wavelengths fall in the green to yellow-green region, which correspond to other cone pigments (green- or red-sensitive), not cyanolabe. So 426 nm is the best match for the maximal absorption of cyanolabe.

Cyanolabe is a short-wavelength cone pigment, tuned to the blue/cyan end of the spectrum. Its peak sensitivity sits around the violet-blue region, typically near 420–430 nm. Among the options, 426 nm is the only value in that short-wavelength range, matching cyanolabe’s blue-sensitive character. The other wavelengths fall in the green to yellow-green region, which correspond to other cone pigments (green- or red-sensitive), not cyanolabe. So 426 nm is the best match for the maximal absorption of cyanolabe.