focal plane

focal plane

noun Optics.

  1. a plane through a focal point and normal to the axis of a lens, mirror, or other optical system.Compare principal plane.
  2. the transverse plane in a telescope where the real image of a distant view is in focus.


  1. the plane that is perpendicular to the axis of a lens or mirror and passes through the focal point
  2. the plane in a telescope, camera, or other optical instrument in which a real image is in focus

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