Question

What defines the focusing in SEM

Answer 1

used Ancanning electron microncope (SEM) in a type of electron microncope that producen imagen of a nample by scanning the surface with a focuned beam of electrom Ancanning electron microncope (SEM) ncana a fou electron beam over a surface to create an image. The electronn in the beam interact with the namble a producing various signala that can be uned to obtain information about the nurface topography and componition. SEMO may have condenner and objective lenned, but Their function is to focus the beam to a opot, and not to image the specimen. A SEM typically hon ordern of magnitude better dept of focus than a optical microncope making SEM nuitable for studling rough surface. SEM in based on acattered electrono. SEM focunen on the sample nurface and its componition. SEM allowa for Lorige amount of sample to be analysed at a time SEM also provides a three dimennional image