Optical condenser

In Optical, a condenser is system optical comprising several lenses, of large opening (and thus of poor optical quality) making it possible to concentrate a broad beam of light in a plan not obstructing the observation, not supplemented of a diaphragm which will define the intensity of it. Thus, in a microscope, the focusing of the source of light in the plan of the object observed would be harmful with the built image. The condenser makes it possible to focus the image of the filament (for example, of the source consisted an electric bulb) in a different plan. The resulting effect must be a beach of light regular, homogeneous, without defect, adjustable in quantity, in the plan of the object placed between two blades of glass (Biology), or its equivalent in the case of polished and reflective object (Industry), not disturbing any the visual analysis. In the old microscopes or of reduced invoice, whose source of light was the Sun, the condenser unit was a directional mirror. In the case of a closer source of light, the mirror was concave to destroy of them the details of the image of the source, thus acting as condenser.

See also: List of the scientific instruments.

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