ultramicroscope

A microscope with high-intensity illumination used to study very minute objects, such as colloidal particles that scatter the light and appear as bright spots against a dark background.

An instrument for rendering visible, by means of diffractive effects, bodies below the limit of the resolving-power of the microscope.

a microscope that uses bright illumination against a black background to view small particles

light microscope that uses scattered light to show particles too small to see with ordinary microscopes