focal length









focal length


noun Optics.

  1. the distance from a focal point of a lens or mirror to the corresponding principal plane. Symbol: f
  2. the distance between an object lens and its corresponding focal plane in a telescope.

noun

  1. the distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens

n.

  1. The distance from the surface of a lens or mirror to its focal point.focal distance focus

  1. The distance between the optical center of a lens or mirror to its focal point.

The distance between the focal point of a lens (that is, the point at which the lens will focus parallel rays of light) and the lens itself.

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