electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
an elementary particle with negative charge
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
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
genus of small erect or climbing herbs with pinnate leaves and small inconspicuous white flowers and small flattened pods: lentils
(metaphor) a channel through which something can be seen or understood
