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Class notes AS Unit F213 - Practical Skills in Biology 1 OCR AS/A level Biology A Student Book 1 $9.04
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Class notes AS Unit F213 - Practical Skills in Biology 1 OCR AS/A level Biology A Student Book 1

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This document covers types of microscopes, when and how they might be used and advantages and disadvantages to each one.

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  • October 19, 2023
  • 2
  • 2023/2024
  • Class notes
  • Caroline
  • 2.1
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Microscopes
Magnification describes how much bigger an image appears in a microscope compared to the original object.
Microscopes produce linear magnification


The resolution of a microscope is the ability of an optical instrument to see or produce an image that shows fine
detail



Optical microscope-

- cheap
- easy to use
- portable
-can study whole living specimen
- have a limited resolution
- magnification varies from X1500 to X2000


Laser scanning
microscopes-

- use laser light to scan an object point by point
- images displayed are high resolution and show high contrast



Electron microscopes-

- use a beam of fast travelling electrons
- much better resolution than confocal microscopes

- electrons fired from a cathode and focused by magnets




To calculate magnification, you use the
equation


total magnification = power of objective
lens X power of eyepiece lens

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