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- ...oil immersion objectives (McCrone and Delly 1972). In most cases, the Abbe lens system is not corrected for [[spherical%20aberration|spherical aberration]] ...Particle Atlas'', W. McCrone Associates, Chicago, IV, 1972 Comment: Three lens versions give numerical aperture of 1:401 KB (149 words) - 13:15, 18 April 2022
- ...hose with high values. The human eye can resolve to about 100 micrometers. Compound microscopes can resolve down to 1 micrometer while electron microscopes can1 KB (162 words) - 15:30, 4 October 2022