prism (optics)

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In optics, a (usually) triangular block of transparent material (plastic, glass, or silica) commonly used to ‘bend’ a ray of light or split a light beam (for example, white light) into its component colours. Prisms are used as mirrors to define the optical path in binoculars, camera viewfinders, and periscopes. The dispersive property of prisms is used in the spectroscope.

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