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A prism is an optically transparent system in the form of a geometric body a prism. Optical prisms are divided into three large and clearly distinguished classes: spectral prisms (refractive or dispersion prisms for decomposing light into a spectrum), reflective prisms (for changing the direction of light) and polarization prisms (for linearly polarized light). They are mainly made of glass, quartz, fluorite, lithium fluoride, potassium bromide and other substances.