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Radiation angleRadiation angle: In fiber optics, half the vertex angle of the cone of light emitted at the exit face of an optical fiber.Note: The cone boundary is usually defined (a) by the angle at which the far-field irradiance has decreased to a specified fraction of its maximum value or (b) as the cone within which there is a specified fraction of the total radiated power at any point in the far field. Synonym output angle. Source: from Federal Standard 1037C and from MIL-STD-188 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Radiation angle".