AP BIOLOGY

Detailed explanation-1: -The electron microscope uses a beam of electrons and their wave-like characteristics to magnify an object’s image, unlike the optical microscope that uses visible light to magnify images.

Detailed explanation-2: -This makes electron microscopes more powerful than light microscopes. A light microscope can magnify things up to 2000x, but an electron microscope can magnify between 1 and 50 million times depending on which type you use! To see the results, look at the image below.

Detailed explanation-3: -A stream of electrons is formed (by the Electron Source) and accelerated toward the specimen using a positive electrical potential. This stream is confined and focused using metal apertures and magnetic lenses into a thin, focused, monochromatic beam. This beam is focused onto the sample using a magnetic lens.

Detailed explanation-4: -An electron gun at the top of a TEM emits electrons that travel through the microscope’s vacuum tube. Rather than having a glass lens focusing the light (as in the case of light microscopes), the TEM employs an electromagnetic lens which focuses the electrons into a very fine beam.

Detailed explanation-5: -A simple light microscope manipulates how light enters the eye using a convex lens, where both sides of the lens are curved outwards. When light reflects off of an object being viewed under the microscope and passes through the lens, it bends towards the eye. This makes the object look bigger than it actually is.