Question

Which of the following best explains how a scanning electron microscope is used to produce an image of a specimen?

A. An electron beam strikes the specimen, is absorbed by the specimen, and used to produce an electrically charged image on a screen.

B. An electron beam passes over the specimen’s surface and displaces electrons, which are then focused on a screen to form an image.

C. An electron beam traces an outline of the specimen onto a screen, and reflected electrons are collected to form the rest of the image.

D. An electron beam travels through the specimen, and as it doe