| Standardization field | Electrical engineering
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| Technical committee | BAS/TC 30- Electric cables |
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| Term (EN) | group index, (symb.: N) |
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| Definition (EN) | The velocity of light in vacuum, divided by the magnitude of the group velocity of the mode.
Notes.
1 — For a plane wave of wavelength λ, it is related thus to the refractive index n:
N = n - λd_n/d_λ
where λ is the wavelength.
2 — Each mode has its own group index. |
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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) | grupni indeks, (simbol: N) |
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| Definition (SR) | Brzina svjetlosti u vakuumu, podijeljenja magnitudom grupne brzine moda.
Napomene
1 – Za ravni talas talasne dužine λ, on je povezan sa indeksom prelamanja n:
N = n - λd_n/d_λ
gdje je λ talasna dužina.
2 – Svaki mod ima svoj vlastiti grupni indeks. |
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| Date | 2017-08-09 |
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| Standards | BAS IEC 60050-731:2017 |
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