Give+a+brief+description+of+the+way+an+SEM+works

As I have explained above, the SEM uses electrons instead of light to form an image. “A beam of electrons is produced at the top of the microscope by heating of a metallic filament. The electron beam follows a vertical way through the column of the microscope.” It makes the way through electromagnetic lenses that direct the beam down towards the sample. And when it hits the sample, other electrons ([|backscattered] or [|secondary]) are ejected from the sample. “Detectors collect the secondary or backscattered electrons, and convert them to a signal that is sent to a viewing screen similar to the one in an ordinary television, [|producing an image.]”

= This figure will help you to understand much easier how SEM works. http://mse.iastate.edu/microscopy/path2.html