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  • reflectance The ratio of reflected flux to incident flux. Unless otherwise specified, the total reflectance is meant; it is sometimes convenient to divide this into the sum of the specular and the diffuse reflectance.
  • reflection Return of radiation by a surface, without change in wavelength. The reflection may be specular, from a smooth surface; diffuse, from a rough surface or from within the specimen; or mixed, a combination of the two.  
  • reflector A type of conducting surface or material used to reflect radiant energy.
  • coupler 1. In color development, the chemical that combines with certain by-products of the development procedure to form a dye. 2. Device for distributing optical power among two or more ports. 3. Device for coupling optical power between a waveguide and a...
  • radiant energy The energy passed on as electromagnetic radiation; e.g., radio, heat or light waves.
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