B1.1- The world of the microscope

  • Created by: H_Coveney
  • Created on: 09-12-17 15:19
View mindmap
  • B1.1- The world of the microscope
    • Light microscopes
      • Was first developed in the mid-17th century and are still used today.
      • They use a beam of light and lenses to form an image.
      • They can magnify up to x2000 but most only magnify several hundred times.
      • They are relatively cheap.
      • They can be used to magnify live specimens, cells and large subcellular structures e.g. nuclei.
      • They can be used almost anywhere.
    • Electron microscopes
      • Was first developed in the 1930s.
      • They use a beam of electrons to form an image.
      • They can magnify x2,000,000
      • They are very expensive.
      • They are large and have to be kept in special temperature, pressure and humidity controlled rooms.
      • They allow us to see smaller things in more detail e.g. internal structures of mitochondria and chloroplasts and evne smaller things like ribosomes and plasmids.
      • They have a higher resolution.
      • Transmision Electron Microscopes (TEM)
        • Give 2D images with very high magnification and resolution.
      • Scanning Electron Miscroscopes (SEM)
        • Give dramatic 3D images but with lower magnification.
    • Magnification and resolving power.
      • magnification = size of image / size of real object
      • resolution- the ability to distinguish between two separate points, not appearing as one object (sharper image)
      • resolving power of a microscope- is how much detail it can show.

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all microscopes resources »