Eeskirjas kasutatavad terminid ja mõisted: tahavaatepeegel, tahavaatepeegli tüüp, tahavaatepeegli klass, kumerusraadius r, põhilised kumerusraadiused ri ja r'i, kumerusraadius rp, peegli keskpunkt ja tahavaatepeegli koostude kumerusraadius.
... six of these lenses may be replaced by six samples of material at least 60 mm × 80 mm size, having a flat or convex outer surface and a substantially flat area (radius of curvature not less than 300 mm) in the middle measuring at least 15 mm × 15 mm) ...
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