Optics.
the angle formed at a nodal point of a lens by the intersection of two lines drawn from the opposite ends of an image produced by the lens.
Optics.
the angle formed at a nodal point of a lens by the intersection of two lines drawn from the opposite ends of an image produced by the lens.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012