| Standardization field | Electrical engineering | 
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| Technical committee | BAS/TC 30- Electric cables | 
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| Term (EN) | refractive index (of a medium), index of refraction, (symb.: n) | 
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| Definition (EN) | At a point in a medium and in a given direction, the ratio of the velocity of light in vacuum to the phase velocity of a sinusoidal plane wave propagating in that given direction. | 
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| Term (FR) |  | 
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| Definition (FR) |  | 
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| Term (DE) |  | 
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| Definition (DE) |  | 
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| Term (BS) |  | 
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| Definition (BS) |  | 
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| Term (HR) |  | 
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| Definition (HR) |  | 
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| Term (SR) | prelomni indeks (medijuma), indeks prelamanja,  (simbol: n) | 
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| Definition (SR) | U tački medijuma i u datom pravcu odnos brzine svjetlosti u vakuumu i fazne brzine sinusoidalnog ravnog talasa koji se prostire u datom pravcu. | 
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| Date | 2017-08-09 | 
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| Standards | BAS IEC 60050-731:2017 | 
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