Microscopes

• Electron microscopes:

  Produces an electron beam which has a short wavelength, meaning that is has a high-resolution power.

  Require very specific conditions so cannot study living organisms.
• Transmission electron microscope – Consists of an electron gun which produces a beam of electrons passing through the specimen.
• Scanning electron microscope – Bounces electrons off the surface of a specimen to provide a 3D image by analysing how the electrons were scattered.
• Magnification = Image size \ Actual size
• Magnification is the ratio of the size of the image to the size of the object.
• Resolution is the minimum distance apart that two objects can be and still distinguished as separate objects.
• Light microscopes produce beams of visible light which pass through the sample and is bent through the glass lens system, allowing the user to see a magnified image.