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Definition of focal axis in English: focal axisnoun 1Geometry the line passing through the focus or foci of a conic section, perpendicular to the directrix. 2Optics the line which passes through the focal point (or points) of a curved mirror or lens and its centre; the line which passes through the centre of each lens in a compound lens, telescope, microscope, or other optical instrument.
Definition of focal axis in US English: focal axisnoun 1Geometry the line passing through the focus or foci of a conic section, perpendicular to the directrix. 2Optics the line which passes through the focal point (or points) of a curved mirror or lens and its centre; the line which passes through the centre of each lens in a compound lens, telescope, microscope, or other optical instrument.
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