Microscopes

• the base of a microscope is heavy to ensure the microscope stays upright
• thew objective lens have a strength from 4x to 100x magnification
• the arm is used to carry the microscope
• the eyepiece ha a magnification of 10x and is used to view the specimen
• the coarse focus dial moves the stage up and down to focus the image through the eyepiece
• the fine focus dial is used for sharp focus of the image
• the lamp is used to project light to the specimen so that it can be seen clearly
• the stage is the platform where you place your slide
• light microscope advantages

  • easy to use
  • portable
  • cheap (around £50)
  • can use to see live specimen
• light microscope advantages

  • low magnification
  • low resolution
  • 2D images only
• electron microscope advantages

  • high resolution
  • high magnification
  • 3D images
• electron microscope disadvantages

  • not easy to use
  • not portable
  • expensive ( around £ 800,000)
  • can only view dead samples
• to work out magnification you do image size divided by real size
• • millimetres x1000 to get to micrometres
  • micrometres x1000 to get to nanometres
  • nano metres divided by 1000 to get to micrometres
  • micrometres divided by 1000 to get to millimetres