| http://www.w3.org/ns/prov#value | - Apart from surface configuration to attain the predictable divergence of the two surfaces, all other parameters such as the intensity and wavelength content of the light to be reflected, the angle of incidence of the light to the internally reflecting surface, the index of refraction of the glass block and the media on which the surface 18 is formed, remain the same during calibration and during u
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