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Telescopes from the Ground Up

Chromatic aberration

Visible light is made of different colors. When visible light passes through a glass lens or a prism, it gets dispersed, or split, into its many colors. A lens focuses each color at a different point, causing a fringe of color to appear around bright objects.

Looking at only red and blue light:

Diagram demonstrating chromatic aberration caused by a standard convex lens.
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