Electron Microscope

negatron Microscope An electron microscope is a microscope that uses a beam of electrons quite an than light. negatron microscopes have a much better consequence than standard ocular microscopes . This is because the wavelength of visible light is very commodious and so generates an visualize of poor resolution. negatron microscopes however assemble much higher levels of resolution because of the very short wavelength of the electron bean which is used. The electron beam is negatively charged and so electromagnets can be used to focus the image this allows a greater level of precision than would be available in a normal visual microscope when trying to focus the image. electron microscopes can resolve objects that be 0.1 nm apart which is 2000 measuring rod more(prenominal) than you can resolve with a standard optical microscope. Because the electrons which atomic number 18 used in the EM microscope are deflected by particles in the air the microscope has to be kept at a near vacuum state in order for a useful image to be seen. EM microscopes also withdraw the object that is being magnified to be dead whereas optical microscopes can view live cells and hence show establish of what is happening rather than just a freeze frame. electron microscopes also cost a significant amount of coin to buy and maintain.

It is also possible for electron microscopes to have artefacts which are structural details caused by the preparation of the example. TEM Transmission negatron Microscope A beam of electrons is passed through a thin object. more or less areas absorb the electro ns and others dont allowing an image to be c! reated. fuelt be done on living specimens. A complex staining process is require even if no colour is penuryed in the final image. The specimen must(prenominal) be extremely thin for the electrons to pass through it. It gives a flat 2 dimensional image. SEM Scanning Electron Microscope The SEM has the same limitations as the TEM in that it can only done on dead specimens and it requires a complex staining process however...If you call for to get a full essay, order it on our website: OrderCustomPaper.com

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