| NOUN | relation | index of refraction, refractive index | the ratio of the velocity of light in a vacuum to that in a medium |
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| Meaning | The ratio of the velocity of light in a vacuum to that in a medium. | |
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| Synonym | refractive index | |
| Broader | ratio | The relative magnitudes of two quantities (usually expressed as a quotient) |
| Spanish | índice de refracción | |
| Catalan | índex de refracció | |
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