a combination of static or varying electric and magnetic fields, used to focus streams of electrons in a manner similar to that of an optical lens.
[ 1930-35 ]
a combination of static or varying electric and magnetic fields, used to focus streams of electrons in a manner similar to that of an optical lens.
[ 1930-35 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012