n :  an adjustable substage lens used as a condenser for a compound microscope
 
Abbe, Ernst Karl (1840-1905), German physicist. Abbe was a professor of physics and mathematics, a director of astronomical and meteorological observatories, and a research director at an optical works. He made a great number of improvements in the design of the microscope. He introduced the apochromatic lens system in 1868, his condenser for compound microscopes in 1870, and an oil immersion lens in 1878.
 
   
 
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