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Biology report on microscopes.

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Introduction

´╗┐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.

Middle

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.

Conclusion

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.

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