Electron Microscope Essay

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Electron microscope Electron microscopy is a type of microscope. That uses a beam to create an image of a specimen. It has a higher magnification and resolution than a light microscope and allows you to see more detail in a specimen. Helping us to find out about the detailed structure of cells. Electron microscopy uses smaller wavelength than light, which means the electron microscope can show two objects close together as spate objects. There are two types of electron microscope, scanning electron microscope and transmission electron microscope. Transmission electron microscope The original form of electron microscope, Transmission electron microscope involves high voltage electron beam emitted by a cathode. The electron beam that has been transmitted thought the very thin specimen. The specimens observed are called sections and need to be very thin to allow electrons to pass though. The specimen carries information about the specimen structure. The image is then magnified by a series of magnetic lenses until it is recorded by a fluorescent screen or a light sensitive senor such as CCD, which means charge-coupled device. Transmission electron microscope produces two-dimensional in black and white images. The resolution of the transmission is limited this is mainly because the specimen preparation limits the resolution of what we can see in the electron microscope, rather than the microscope itself. Organelles in a pollen grain of tobacco Scanning electron microscope Unlike the transmission electron microscope, scanning electron microscope where the primary beams are transmitted though the sample given the primary electrons kinetic energy which produces images by detecting secondary electrons. In scanning electron microscope the electron beam is scanned across the surface of the sample, with detectors building up an image.

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