Optics.
a lens that causes a beam of parallel rays to diverge after refraction, as from a virtual image; a lens that has a negative focal length. Also called negative lens . Cf. converging lens .
Optics.
a lens that causes a beam of parallel rays to diverge after refraction, as from a virtual image; a lens that has a negative focal length. Also called negative lens . Cf. converging lens .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012