Definition of focal plane in English:

focal plane

Line breaks: focal plane


  • The plane through the focus perpendicular to the axis of a mirror or lens.
    More example sentences
    • Then, the cell- and bead-holding pipettes were carefully aligned to get the focal plane and the plane of cell-bead contact to coincide.
    • A lens focuses this light at the back focal plane of the objective to allow collimation at the sample.
    • This setup captures only light from the focal plane, while out-of-focus Raman light and fluorescence background is strongly rejected.

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
(in science fiction) navigation in outer space