Equilateral prisms have three equal 60° angles. Thanks to their geometry and optical properties, which separate light of different wavelengths, they are often used as dispersive prisms and are widely applied in spectral analysis and other fields.
Dispersive prisms are usually triangular in cross-section. Because different wavelengths of light are refracted at different angles in the same material, they can decompose polychromatic light into monochromatic light, playing a key role in spectrometers, optical parametric oscillators, and other instruments.
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