FOCAL PLANE


Meaning of FOCAL PLANE in English

Optics.

1. a plane through a focal point and normal to the axis of a lens, mirror, or other optical system. Cf. principal plane .

2. the transverse plane in a telescope where the real image of a distant view is in focus.

[ 1890-95 ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .