| 1. | For more details, see the main article, oil immersion.
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| 2. | Without oil immersion, the maximum usable magnification is around 800?
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| 3. | An oil immersion lens usually has a magnification of 40 to 100?
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| 4. | Oil immersion objectives typically have even larger numerical apertures so improved optical sectioning.
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| 5. | For this reason oil immersion is commonly used to obtain high resolution in microscopy.
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| 6. | Numerical apertures as high as 1.6 can be achieved with oil immersion.
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| 7. | Another option is to use oil immersion techniques.
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| 8. | An oil immersion condenser may typically have NA of up to 1.25.
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| 9. | Oil immersion objectives are used only at very large magnifications that require high resolving power.
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| 10. | An oil immersion objective is an objective lens specially designed to be used in this way.
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