Salma Ahmed
English Lit. GCSE Student
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Advantage and disadvantage of using an optical and electron microscope.
- Words:
- 692
- Submitted:
- Tue Feb 24 2004
Have a little read: ... ADVANTAGE AND DISADVANTAGE OF USING AN OPTICAL AND ELECTRON MICROSCOPE In this essay I will be talking about all the different types of Optical and Electron Microscopes and what there uses are and what the Advantage and Disadvantage of them both are. Electron Microscope An electron microscope uses electrons to illuminate an object. Because electrons have a smaller wavelength than light has it can resolve much smaller structures than light can. The resolution is very good. The minimum wavelength of an optical microscope is 500nm whereas the smallest wavelength of electrons in an electron microscope is round about 0.005nm. The microscope has many different features. It has an electron gun so that it can emit electrons onto the specimen so it can create a magnified image. Magnetic lenses that create the magnetic fields are used to direct and focus the electrons onto the specimen. The microscope uses a vacuum system because electrons are
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