Types of Electron Microscope

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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?

Because it produces images by scanning a focused electron beam onto the surface of the specimen (A) Signup and view all the answers

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

Carbon or collodion (B) Signup and view all the answers

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

Camera (A) Signup and view all the answers

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

Because fewer electrons strike that area of the screen after being scattered (B) Signup and view all the answers

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

To form the intermediate magnified image (C) Signup and view all the answers

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

Transmission Electron Microscope (TEM) (B) Signup and view all the answers

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

By emitting secondary electrons from the surface of the specimen (A) Signup and view all the answers

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

Scanning Electron Microscope (SEM) (D) Signup and view all the answers

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

Imaging the interior of cells in thin sections (B) Signup and view all the answers

What is a major advantage of using an electron microscope?

High resolution (A) Signup and view all the answers

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

To prevent specimen distortion (B) Signup and view all the answers

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

By studying microorganisms at high magnification (C) Signup and view all the answers

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

Specimen should be completely dry (C) Signup and view all the answers

Which characteristic contributes to the diverse applications of electron microscopes?

Extremely high magnification (B) Signup and view all the answers

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

Their ability to produce high-resolution electron micrographs (D) Signup and view all the answers

Condenser Lens Function

The condenser lens in a scanning electron microscope focuses the electron beam onto the specimen.

Projector Lens Purpose

The projector lenses (ocular) in an electron microscope produce the final magnified image that is visible to the observer.

Objective Lens Role

The objective lens in a scanning electron microscope forms the intermediate magnified image of the specimen.

Scanning Electron Microscope (SEM)

A scanning electron microscope produces images by scanning a focused electron beam across the surface of the specimen, emitted electrons create the image.