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The Quiet Genius Inside an Optical Telescope: The Prism

When we imagine an optical telescope, we often picture a long tube pointed toward the night sky, quietly gathering starlight from galaxies millions of light-years away. We might think of grand observatories like the Hubble Space Telescope orbiting above Earth, or historic instruments such as the Yerkes Observatory with its massive refracting lens. Yet hidden inside many telescopes is a small but brilliant component that rarely gets the spotlight: the prism.

A prism in an optical telescope is far more than a decorative piece of glass. It is a carefully shaped optical element, usually made from high-quality glass, designed to bend, reflect, or disperse light with remarkable precision. Its job depends on where and how it is used. In some telescopes, a prism redirects the path of light so that the viewer can observe comfortably. In others, it splits light into…