• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

What is an Electron Microscopy?

Extracts from this document...


Electron Microscopy

What is an Electron Microscopy?                          image00.jpg

        Microscopes are used to look at objects that cannot be seen by the naked eye. There are two types of microscopes: light microscopes which use light to see the image these microscopes use lenses and light to project the

...read more.


How does it work?

  1. Electrons are fired from an electron gun.
  2. Electrons then travel through a vacuum.
  3. They go through the specimen and objective lens.
  4. The electrons then hit a flourescent screen and make light.
  5. The light makes a picture (electron micrograph), which is visible to the human eye.

...read more.


They can focus using magnets so can get very good micrographs.


  • Very expensive.
  • Very big.
  • Sometimes artefacts are made (not what is in the specimen can be seen)
  • Hard to cut specimen so thin.
  • Sometimes electrons do not pass.
  • Living specimens cannot be seen.
  • Must be stained in very expensive stains such as gold and silver.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Microscopes & Lenses section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Microscopes & Lenses essays

  1. Peer reviewed

    The advantages and limitations of electron microscopy.

    4 star(s)

    Dehydration. The specimen is dehydrated slowly by using increasing concentrations of ethanol or propanone (alcohol has a dehydrating effect as it absorbs water) 3. Clearing. The specimen is immersed in xylol as this makes the specimen transparent. 4. Embedding. The specimen is embedded in a substance such as araldite.

  2. Optical and Electron Microscopy

    the length of one eyepiece unit is obtained for each magnification enabling dimensions of minute objects to be measured. There are two types of preparation for viewing freshly killed biological material under a compound microscope - permanent preparation and temporary preparation.

  1. My experiments focus is to obtain an accurate measurement for a specific lenss power.

    Accuracy: All but one of the plotted points come into contact with the line of best fit. This indicates that my results are quite accurate. The U=325 result is not intercepted and so can be classed as an outlier. Reliability: The reliability of the first graph cannot be summarised well

  2. The eye.

    Rods Approx. 143million per eye - twilight or night vision i.e., vision in low light intensities. Lamellae contain a photosensitive pigment called rhodopsin which consists of a protein called opsin attached to retinal (a derivative of Vitamin A). When exposed to light, rhodopsin splits into opsin and retinal.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work