an electron lens consisting of a system of metal electrodes, the electrostatic field of which focuses the charged particles
electrostatic lens in American English
noun
an electron lens that focuses an electron beam by passing it through a series of electrodes kept at different voltages
Word origin
[1950–55]This word is first recorded in the period 1950–55. Other words that entered Englishat around the same time include: action painting, bleep, hot line, speech recognition, wiretap