Download the optical (light) microscope

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Fig. 6 Plano-type objective lenses and cross sections through each. The lens shown
in (c) is a 14-element oilimmersion objective, with a numerical aperture (NA) of 1.32.
Because the lens and specimen must be cleaned between each use, oil immersion is
rarely used; it does provide higher resolution and a crisper image, which is valuable
for examining low-reflectivity specimens. (E. Leitz, Inc.)