Which wavelengths bend more as they enter the eye, according to chromatic aberration considerations?

• A. Green wavelengths
• B. Red wavelengths
• C. Blue wavelengths
• D. Yellow wavelengths

Answer: (A)

Chromatic aberration arises because the eye’s optical media refract different wavelengths by different amounts. The refractive index is higher for shorter wavelengths, so blue light bends more than green, and green bends more than red. This means blue light tends to focus closer to the front of the eye (and red light farther back), with green somewhere in between. So, among common visible colors, blue wavelengths bend the most as they enter the eye, followed by green, then red.