Question

Ultramicroscope has been devised on which principle

Answer 1

ultramicroscope is a light optical microscope that enables the visualization of sub-micron dispersed particles. The working principle is based on darkfield imaging using an extremely high numerical aperture illumination. This is achieved by the cyto-viva condenser arrangement. Simply speaking this generates a quasi-perpendicular illumination of the sample particles so that the direct illumination doesn´t enter the objective lens.