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| IEVref: | 731-03-11 | | ID: |
| Language: | en | | Status: Standard |
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| Term: | refractive index (of a medium)
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| Synonym1: | index of refraction
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| Symbol: | n
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| Definition: | at a point in a medium and in a given direction, the ratio of the speed of light in vacuum to the phase velocity of a sinusoidal plane wave propagating in that given direction
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| Publication date: | 1991-10 |
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| Internal notes: | 2016-03-07: Editorial changes: "velocity of light in vacuum" replaced by "speed of light in vacuum". See correspondence "Questions re part 731" 2015-02 and 2015-03. JGO |
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