In optics, chromatic aberration (CA, also called achromatism or chromatic distortion) is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens). The refractive index decreases with increasing wavelength.
Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point. Since the focal length f of a lens is dependent on the refractive index n, different wavelengths of light will be focused on different positions.
Read more about Chromatic Aberration: Types, Minimization, Image Processing To Reduce The Appearance of Lateral Chromatic Aberration, Photography
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“The era of the political was one of anomie: crisis, violence, madness and revolution. The era of the transpolitical is that of anomaly: an aberration of no consequence, contemporaneous with the event of no consequence.”
—Jean Baudrillard (b. 1929)