focal length definition

  • noun:
    • the length from the surface of a lens or mirror to its focus. Also called focal length, focus.
    • the length where some thing (example. a lens, mirror etc.) is in focus; in environment it is the distance over the optical axis from a "principal airplane" regarding the lens to at least one associated with the lens's things.
    • the exact distance from a lens to its focus
    • the length from the surface of a lens or mirror to its focus. Also referred to as focal distance, focus.
    • The distance from surface of a lens or mirror to its center point. Also called focal distance, focus.
    • the exact distance from the surface of a lens or mirror to its focus. Also known as focal distance, focus.
    • The distance from which anything (e.g. a lens, mirror etc.) is in focus; in atmosphere it's the distance over the optical axis from a "principal jet" for the lens to one associated with lens's things.
    • The distance from which one thing (example. a lens, mirror etc.) is within focus; in air it's the distance over the optical axis from a "principal plane" of lens to 1 of lens's focal points.
    • the length where some thing (e.g. a lens, mirror etc.) is within focus; in atmosphere this is the length along the optical axis from a "principal airplane" of the lens to one associated with lens's points of interest.
    • the exact distance through the area of a lens or mirror to its focus. Also known as focal distance, focus.
    • the distance from a lens to its focus
    • the length from a lens to its focus
    • the length of which something (example. a lens, mirror etc.) is in focus; in environment it will be the distance over the optical axis from a "principal plane" of the lens to one associated with lens's points of interest.
    • the distance from a lens to its focus
    • the exact distance from a lens to its focus
    • The distance from surface of a lens or mirror to its focal point. Also known as focal distance, focus.
    • The distance of which some thing (e.g. a lens, mirror etc.) is in focus; in air it's the distance over the optical axis from a "principal jet" of lens to a single associated with lens's things.
    • the distance from a lens to its focus

Related Sources

  • Hypernym for "focal length"
  • Technology Dictionary for "focal length"
    • In optics and photography, the focal…
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