An electron microscope is a type of microscope that produces an electronically-magnified image for in depth observation. The electron microscope(EM) uses a particle beam of electrons to light up the specimen and create a magnified image of it. The microscope has a greater magnification) than a light-powered optical microscope, because it uses electrons that have wavelengths about 100,000 times shorter than visible light (photons) and can achieve magnifications of up to 1,000,000x; in contrast light microscopes are limited to 1000x magnification. The electron microscope uses electrostatic and electromagnetic "lenses" to control the electron beam and focus it to form an image. These lens are analogous to, but unlike the glass lenses of an optical microscope that form a magnified image by focusing light on or through the specimen.
