Chromatic Aberration

More than 200 years ago, Newton showed that white light was composed of multiple wavelengths. Simple lenses will refract (bend) light differentially as a function of wavelength. Short (blue appearing) wavelengths are refracted more than long (red appearing) wavelengths. Consequently, lenses like the one shown above will not image light all in one place.

A lens called an achromatic lens solves this problem.

You may be interested to know that the human eye lens exhibits chromatic aberration. Fortunately, a yellow pigment in the fovea called the macula lutea helps to protect us from this problem. Yellow pigments absorb blue light.

Color/Color Vision
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