In modern arc lamps, metal and oxide electrodes are typically used, and the arc is enclosed in an atmosphere of a high-pressure inert gas, such as xenon or krypton, or mercury vapor, which becomes luminous during arcing. Developed in Germany during World War II for use in high-powered search lights, the particularly bright and penetrating xenon arc lamps are now used in a variety of scientific instruments, such as spectrophotofluorometers, and IMAX theaters. See also electric arc.
Related categories• OPTICS & OPTICAL PHENOMENA
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