a lens system consisting of two or more lenses on the same axis
a whole formed by a union of two or more elements or parts
put or add together
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
a transparent optical device used to converge or diverge transmitted light and to form images
biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retina
genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
