IEVref: 705-04-15 ID: Language: en Status: Standard Term: Rayleigh criterion Synonym1: Synonym2: Synonym3: Symbol: Definition: a criterion which characterizes the degree of roughness of a surface, for a given grazing angle of an electromagnetic wave according to the value of the quantity: $\frac{h\mathrm{sin}\theta }{\lambda }$ where h is the average height of the surface irregularities, θ is the grazing angle relative to the average surface, λ is the wavelength NOTE – In practice, roughness is negligible and the surface is considered specular if: $\frac{h\mathrm{sin}\theta }{\lambda }<\frac{1}{100}$ Publication date: 1995-09 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 705-04-151.gif 2017-06-02: Cleanup - Remove Attached Image 705-04-152.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: