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  1. Oxford American Dictionary

    refractive index

    • IPA[rəˈfræktɪv]

    美式

    • n.
      the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

    • noun: refractive index, plural noun: refractive indices

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    refractive index

    英式

    • n.
      the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

    Oxford Dictionary