Abstract
In this chapter I discuss the bright-field microscope, perhaps, along with the telescope, one of the most elegant and important scientific instruments ever invented. I discuss some of the discoveries made with the bright-field microscope. I discuss the components of the bright-field microscope, particularly the objective lenses. I discuss the aberrations that can occur in the objective lenses and the methods used to correct them in order to obtain high-quality objectives. I discuss how to establish Köhler illumination and the optical paths taken by the illuminating rays and the image forming rays in the bright-field microscope set up for Köhler illumination. I discuss the use of the bright-field microscope and how to adjust the field and aperture diaphragms to balance resolution, contrast, and depth of field.
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