Optics.
a lens that converts parallel rays of light to convergent rays and produces a real image. Also called positive lens . Cf. diverging lens . See diag. under lens .
Optics.
a lens that converts parallel rays of light to convergent rays and produces a real image. Also called positive lens . Cf. diverging lens . See diag. under lens .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012