microscopes

• Light Microscope:

  • Light shines through an object and is focused by the lenses.
  • Can magnify up to about ×2000. 
  • Have a resolving power of about 200nm
• Robert Hooke: who discovered the cell and the corkscrew structure of the cell.

  
• Eyepiece Lens


  This further magnifies the image. It is called the eyepiece as it is where we look into microscope.
• Arm


  This is used to carry the microscope.
• Clips


  These are used to hold the slide in place whilst viewing the specimen.
• Coarse Focus


  This is used to bring the specimen into rough focus.
• Fine Focus


  This is used after the coarse focus to bring the specimen into sharp focus.
• Illuminator/Light Source


  This provides light for viewing the specimen. It is usually situated at the base of the microscope.
• Objective lens


  This magnifies the image of specimen. There are usually three: 10x, 40x and 100x magnification.
• Stage


  This is a flat surface where the slide containing the specimen is placed.
• Diaphragm (or Iris/Condenser)


  This is used to control the amount of light reaching the specimen.
• Base


  This supports the microscope and provides stability.
• Image of light microscope labelled:

  A) clips

  
• Electron Microscopes:

  • Can magnify up to about ×2000000.
  • Have a resolving power of around 0.2nm.
  • Uses electrons (which have a much smaller wavelength) instead of visible light to create an image .