18 Questions
What is the main function of the condenser lens in a scanning electron microscope?
Focus the electron beam on the specimen
What is the purpose of the projector (ocular) lenses in an electron microscope?
Produce the final further magnified image
In a scanning electron microscope, what does the objective lens do?
Forms the intermediate magnified image
Why is a scanning electron microscope named as such?
Because it produces images by scanning a focused electron beam onto the surface of the specimen
What material is typically used for the specimen holder in an electron microscope?
Carbon or collodion
Which component of an electron microscope is responsible for recording the final image?
Camera
In an electron microscope image, why do denser regions appear darker?
Because fewer electrons strike that area of the screen after being scattered
What is the role of the objective lens in an electron microscope?
To form the intermediate magnified image
Which type of electron microscope is used to view thin specimens through which electrons can pass?
Transmission Electron Microscope (TEM)
How does a Scanning Electron Microscope (SEM) create an image of a specimen?
By emitting secondary electrons from the surface of the specimen
Which microscope is considered analogous to a stereo light microscope due to its great depth of focus?
Scanning Electron Microscope (SEM)
What is one of the applications of Transmission Electron Microscope (TEM)?
Imaging the interior of cells in thin sections
What is a major advantage of using an electron microscope?
High resolution
Why is the specimen cut into ultra-thin sections before observation in an electron microscope?
To prevent specimen distortion
How does the electron microscope help in the field of microbiology development?
By studying microorganisms at high magnification
What is a main disadvantage of electron microscopes in terms of specimen handling?
Specimen should be completely dry
Which characteristic contributes to the diverse applications of electron microscopes?
Extremely high magnification
Why are electron microscopes often used for quality control and failure analysis in industries?
Their ability to produce high-resolution electron micrographs
Learn about the two types of electron microscopes and how they produce magnified images of specimens by scattering electrons. Understand the roles of objective lenses and ocular lenses in forming the final image.
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