| 单词 | magnetic lens |
| 释义 | > as lemmasmagnetic lens magnetic lens n. (a device producing) a magnetic field capable of focusing a beam of charged particles. ΘΚΠ the world > matter > physics > electromagnetic radiation > magnetism > [noun] > magnetic field > type of field > device producing magnetic lens1919 1919 London, Edinb., & Dublin Philos. Mag. 6th Ser. 38 709 Such a ‘magnetic lens’ is not of much immediate value as the magnetic spectrum of positive rays is very complex. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VIII. 33/2 Magnetic lenses are employed as condensers, objectives, and projection lenses in magnetic electron microscopes, as final focusing lenses in the electron guns of cathode-ray tubes, and for the selection of groups of charged particles of specific velocity in velocity spectrographs. 1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxvi. 717 Magnetic lenses are used to focus the beam and deflection coils control the position of the beam. < as lemmas |
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