| NOM | relation | índex de refracció | the ratio of the velocity of light in a vacuum to that in a medium |
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| Sentit | The ratio of the velocity of light in a vacuum to that in a medium. | |
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| General | índex, proporció, raó, ràtio, relació | The relative magnitudes of two quantities (usually expressed as a quotient) |
| Anglès | refractive index, index of refraction | |
| Espanyol | índice de refracción | |
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