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Telescopes from the Ground Up

Dispersion

Visible light is actually made up of different colors. Each color bends by a different amount when refracted by glass. That's why visible light is split, or dispersed, into different colors when it passes through a lens or prism. Shorter wavelengths, like purple and blue light, bend the most. Longer wavelengths, like red and orange light, bend the least.

Diagram demonstrating how a prism uses refraction to create a spectrum.

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