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Prism
Prisms are transparent optical elements having at least two polished plane faces inclined relative to each other, from which light is reflected or through which light is refracted.
Spherical Lenses
Spherical lenses are optical components with surfaces of a constant radius. Typical usage is for focusing, reducing or expanding light-waves.
Optical Windows
Optical Windows are often used to protect optical systems and electronic sensors from an outside environment.