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Chapter 6: Problem 87

All of the following are correct about microscopes EXCEPT (A) resolving power is the same thing as magnification (B) total magnification is determined by multiplying the magnification of the ocular lens by the magnification of the objective lens (C) an electron microscope requires a vacuum column (D) living tissue cannot generally be studied in an electron microscope (E) the scanning electron microscope is best used to study the surfaces of cells

Short Answer

Expert verified
(A) Resolving power is not the same thing as magnification.

Step by step solution

01

Understand the Resolving Power vs Magnification

Resolving power refers to a microscope's ability to distinguish two close objects as separate entities, while magnification refers to how much larger the image appears than its actual size. These terms describe different features of a microscope.
02

Calculate Total Magnification

The total magnification in a microscope is calculated by multiplying the magnification power of the ocular lens by the magnification of the objective lens. This is a true statement.
03

Electron Microscope Requirements

Electron microscopes require a vacuum column because electrons can be scattered by air particles, which would reduce image clarity. This statement is factual.
04

Study of Living Tissue with Electron Microscopes

Electron microscopes typically require the specimen to be dehydrated and sometimes coated with metal, as they cannot view living tissues. This makes the statement about live tissue incompatible with this type of microscope correct.
05

Use of Scanning Electron Microscopes

Scanning electron microscopes (SEMs) are specifically designed to image surfaces at a high resolution, making them excellent tools for studying cell surfaces. This is an accurate statement.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Resolving Power
Resolving power is a key feature of microscopes that determines their ability to differentiate between two points that are close to one another. This is crucial for getting clear, detailed images of microscopic specimens.
The higher the resolving power, the clearer the image because of its capacity to display fine details.
Understanding resolving power is essential for anyone working with microscopes as it affects how much detail can be observed from a specimen. This differs from magnification, which only enlarges the image without necessarily increasing its clarity.
Magnification
Magnification refers to the process of enlarging the appearance of an object through an optical instrument. It's given by the product of the magnifications of the objective and ocular lenses in a compound microscope.
  • Objective Lens: Provides the primary magnification power and is closest to the specimen.
  • Ocular Lens (or Eyepiece): Further magnifies the image produced by the objective lens.
Though magnification enlarges the object, without sufficient resolving power, the enlarged image may appear blurry. This shows the need for a balance between magnification and resolving power to achieve optimal microscopy results.
Electron Microscope
An electron microscope utilizes a beam of electrons for image formation, rather than light, leading to much higher resolution capabilities compared to light microscopes.
  • Transmission Electron Microscope (TEM): Allows for the visualization of a specimen in cross-section.
  • Scans across the sample to produce detailed internal images.
To ensure image clarity, electron microscopes require a vacuum environment to prevent electron scattering.
This means that electron microscopes cannot typically be used with living organisms, as they require specimens to be dried and may involve coating with a conductive material.
Scanning Electron Microscope
The scanning electron microscope (SEM) is a type of electron microscope focusing on surface details of specimens. It provides insight into textures and structures at a microscopic level.
  • SEM works by scanning the specimen with a focused beam of electrons.
  • This interaction produces signals that can be used to construct an image of the specimen's surface.
The SEM is exceptionally useful for analyzing the topography of cells, providing three-dimensional images that are particularly beneficial in material sciences, biology, and forensic investigations.

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