Oil immersion objectives typically have even larger numerical apertures so improved optical sectioning.
2.
Oil immersion objectives are used only at very large magnifications that require high resolving power.
3.
An oil immersion objective is an objective lens specially designed to be used in this way.
4.
An "'oil immersion objective "'is an objective lens specially designed to be used in this way.
5.
Until the development of synthetic immersion oil in the 1940s, cedarwood oil was widely used for the oil immersion objective in light microscopy.
6.
Oil immersion objectives can have practical difficulties due to their shallow depth of field and extremely short working distance, which calls for the use of very thin ( 0.17mm ) cover slips, or, in an inverted microscope, thin glass-bottomed Petri dishes.
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