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Photonics Dictionary

  • ultramicroscope

A dark-field microscope used to view extremely small objects. These objects are suspended in a gas or liquid in an enclosure having a black background. A convergent pencil of bright light enters from one side and comes to focus in the field of view (Tyndall cone) to illuminate the objects. Thus, these objects, unable to be detected by the microscope, form small diffraction ring systems that are perceived as minute, bright specks on a black background.
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