biological microscope black plan objective lens
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A plan objective lens is a type of objective lens used in microscopy. It is designed to produce flat, well-corrected images with a large field of view. The term "plan" refers to the fact that the lens is corrected for spherical aberration, which is a common type of optical aberration that can distort the shape of an image.
Plan objective lenses are commonly used in brightfield and phase contrast microscopy. They are especially useful for examining specimens that have a flat surface, such as tissue culture cells, or for examining large areas of a specimen. Plan objectives are typically available in a range of magnifications and numerical apertures, depending on the specific requirements of the microscopy application.
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