In this article we will discuss about the design of transmission electron microscope, explained with the help of a diagram. In TEM a finely focused beam of electrons from an electron gun is passed through a specially prepared ultra thin section of the specimen. The beam is focused on a small area of the specimen by an electromagnetic condenser lens. [...]
The following points highlight the top eight types of microscopy. The types are: 1. Compound Microscope 2. Bright Field Microscopy 3. Dark Field Microscopy 4. Phase Contrast Microscopy 5. Fluorescent Microscopy 6. Electron Microscopy 7. Transmission Electron Microscopy 8. Scanning Electron Microscopy. Type # 1. Compound Microscope: A microscope is an instrument which makes enlarged image of minute objects near [...]
A compound microscope consists of three main parts: 1. Objective Lens 2. Eye Piece 3. Condensers. Part # 1. Objective Lens: The chief characteristics of the objective lens are: (a) To gather the light rays coming any point to the object, (b) To unite the light in a point of image, (c) To magnify the image. There are three types [...]