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  1. Oxford American Dictionary

    critical angle

    • IPA[ˈkridəkəl ˈaNGɡəl]
    • n.
      the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.

    • noun: critical angle, plural noun: critical angles

    • 更多解釋

    critical angle

    • n.
      the angle of incidence beyond which rays of light passing through a denser medium to the ...

    Oxford Dictionary