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  1. focal length

    美式

    • ph.
      焦距
  2. 知識+

    • 跟optics有關的英文翻譯

      These lenses have positive focal lengths, converge incident light that form both real images and virtual images這些...

    • 光學透鏡的一些句子翻譯

      Like plano-convex lenses, double convex lenses have positive focal lengths and form both real and virtual images. Symmetry is assured...

    • [英文]請教一下英文文法!!

      ... between C of A and D of B and twice of the focal length of B. 當然也有其他的合併方式,但第一句的句型會改變,改變後合併...