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

Biology report on microscopes.

Extracts from this document...


´╗┐What is an electron microscope? An electron microscope is a magnifier that uses electrons to lighten the subject and display a magnified image. The electron microscope has a greater amount of resolution as compared to other microscopes however costs a massive amount more. How do Electron Microscopes work? There are two types of electron microscopes, first being the TEM Transmission Electron Microscope. They work by firing electron beam into a vacuum chamber. These electrons are sped up through an electromagnetic field that also focuses the beam. ...read more.


A SEM Scanning Electron Microscope works differently to a TEM microscope. A sharply focused electron beam moves over the sample to create a magnified image of the surface. Some electrons in the beam scatter off the subject and are collected and counted by an electronic device. Each scanned point on the sample corresponds to a pixel on a television monitor, the more electrons the counting device detects the brighter the pixel on the monitor is. As the electron beam scans over the entire sample, a complete image is displayed on the monitor. ...read more.


The magnifying power of each microscope is massively different, the light microscope has 1000x that of the naked eye however the TEM electron microscope has 1,000,000x and the SEM electron microscope has 100,000x. The price is also substantially different, the light microscope being around £500-£1000 and the electron microscopes the best ones being upto £5,000,000 How does a light microscope work? Light is shone or reflected from underneath a glass slide with the subject is placed between two thin pieces of glass. The image of the object is magnified by lenses in the body of the microscope and the observer sees the image through an eye-piece. By Owain Taylor ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms 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 GCSE Humans as Organisms essays

  1. Marked by a teacher

    Biology Revision notes - Human Biology

    5 star(s)

    Excess mucus can't be moved out of the lungs so smokers need to cough to try and remove it. This is called smokers' cough. Disease caused by smoking: * Cancer - throat, mouth, lungs, oesophagus, bladder * Bronchitis - inflammation of the bronchi - narrower tube * Emphysema - weakened

  2. Work related report

    By working as a team, Nurses achieve more. Vocational Skills Dexterous - Nurses must be able to handle and use small fiddly pieces of equipment. Example: They must be able to use an ejection really steadily and calmly. Failure to use a needle calmly could lead to the needle breaking and getting stuck inside the patient.

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