Types of Electron Microscope
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Questions and Answers

What is the main function of the condenser lens in a scanning electron microscope?

  • Focus the electron beam on the specimen (correct)
  • Produce the final further magnified image
  • Hold the specimen in place
  • Form the electrons into a thin tight beam

    • What is the purpose of the projector (ocular) lenses in an electron microscope?

  • Hold the specimen in place
  • Produce the final further magnified image (correct)
  • Focus the electron beam on the specimen
  • Form the electrons into a thin tight beam

    • In a scanning electron microscope, what does the objective lens do?

  • Generates electrons
  • Focuses the electron beam onto the specimen
  • Forms the intermediate magnified image (correct)
  • Produces the final image

    • Why is a scanning electron microscope named as such?

    <p>Because it produces images by scanning a focused electron beam onto the surface of the specimen</p> Signup and view all the answers

    What material is typically used for the specimen holder in an electron microscope?

    <p>Carbon or collodion</p> Signup and view all the answers

    Which component of an electron microscope is responsible for recording the final image?

    <p>Camera</p> Signup and view all the answers

    In an electron microscope image, why do denser regions appear darker?

    <p>Because fewer electrons strike that area of the screen after being scattered</p> Signup and view all the answers

    What is the role of the objective lens in an electron microscope?

    <p>To form the intermediate magnified image</p> Signup and view all the answers

    Which type of electron microscope is used to view thin specimens through which electrons can pass?

    <p>Transmission Electron Microscope (TEM)</p> Signup and view all the answers

    How does a Scanning Electron Microscope (SEM) create an image of a specimen?

    <p>By emitting secondary electrons from the surface of the specimen</p> Signup and view all the answers

    Which microscope is considered analogous to a stereo light microscope due to its great depth of focus?

    <p>Scanning Electron Microscope (SEM)</p> Signup and view all the answers

    What is one of the applications of Transmission Electron Microscope (TEM)?

    <p>Imaging the interior of cells in thin sections</p> Signup and view all the answers

    What is a major advantage of using an electron microscope?

    <p>High resolution</p> Signup and view all the answers

    Why is the specimen cut into ultra-thin sections before observation in an electron microscope?

    <p>To prevent specimen distortion</p> Signup and view all the answers

    How does the electron microscope help in the field of microbiology development?

    <p>By studying microorganisms at high magnification</p> Signup and view all the answers

    What is a main disadvantage of electron microscopes in terms of specimen handling?

    <p>Specimen should be completely dry</p> Signup and view all the answers

    Which characteristic contributes to the diverse applications of electron microscopes?

    <p>Extremely high magnification</p> Signup and view all the answers

    Why are electron microscopes often used for quality control and failure analysis in industries?

    <p>Their ability to produce high-resolution electron micrographs</p> Signup and view all the answers

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