| 1. | An oil immersion lens usually has a magnification of 40 to 100?
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| 2. | All specimens, regardless of consistency, are permanently stained prior to microscopic examination with an oil immersion lens.
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| 3. | This discovery remained controversial until the development of the oil immersion lens in 1884 and of superior staining methods in 1890 1891.
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| 4. | Use of an oil immersion lens with the incorrect immersion oil, or without immersion oil altogether, will suffer from spherical aberration.
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