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

A comparison between light microscopes with electron microscopes

Extracts from this document...

Introduction

A comparison between light microscopes with electron microscopes The word microscope comes from the Greek words micron, meaning small, and scopos, meaning aim. To date, it is still unclear as to who actually invented the light microscope. It has often been said that Hans Janssen and his son Zacharias Janssen were the ones to have invented the light microscope in 1590, but this date is very unlikely considering Zacharias was born in 1590. It has also been said that Galileo Galilei was the inventor as he developed a light microscope with a convex and a concave lens in 1609. His microscope was celebrated in the 'Lynx Academy'. In the late 1600s, Christiaan Huygens developped a simple 2 lens ocular system which was corrected and therefore a step forward in the microscopic development. One man, however, is generally credited with bringing the microscope to the attention of biologists. ...read more.

Middle

Instead, they point a stream of electrons at the specimen and a computer attached to the microscope analyses how the electrons are scattered by the material. The specimen, however, must be suspended inside a vacuum chamber. When scientists use electron microscopes, they get views of the slices of the object in two dimensional form, but in different depths. As these instruments are very powerful, both the resolution and the degree of magnification are very high. Light microscopes are entirely operated by hand and use a light bulb to illuminate the specimen which is mounted between two glass slides and clipped onto the stage just under the main lens, on top of the light source. A dial is used to focus the image. These tools use a simple series of magnifying lenses and mirrors to bring the image up to an eyepiece. Light microscopes are mostly used in biology. ...read more.

Conclusion

Using a light microscope enables you to view specimens in colour, and living specimens can also be observed, hence their movement can be studied. Contrasting to light microscopes, electron microscopes are unable to view live specimens, as they have to be prepared using various techniques including staining, dehydration and placement in a vacuum. Images coming from the electron microscope are monochrome, and therefore no colour can be seen on the images. Electron microscopes have a smaller field of view than light microscopes. Electron microscopes come with a very high price tag compared to light microscopes, but the greater the magnification of a light microscope, the higher the price as well. Light microscopes also cause health related problems, for example, eye fatigue. Light microscopes also lower efficiency, speed and its accuracy as images have to be hand drawn, and therefore the image is difficult to share. For beginners and students, light microscopes are used in classes as they are easier to use than electron microscopes, which are more complex. ?? ?? ?? ?? Macha Cauchois ...read more.

The above preview is unformatted text

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

Here's what a star student thought of this essay

3 star(s)

Response to the question

The candidate starts with a good opening sentence, they define the terms linked with the word microscope, which is good way to engage the reader. However their introduction is just one sentence. A good introduction should include what you plan ...

Read full review

Response to the question

The candidate starts with a good opening sentence, they define the terms linked with the word microscope, which is good way to engage the reader. However their introduction is just one sentence. A good introduction should include what you plan to discuss, so that you introduce your essay. However the candidates overall response to this topic is good, they describe how both types of microscopes work and have compared the basic proprieties of each, such as resolution and magnification.

Level of analysis

The candidate could have developed this essay further by going on to discuss the ways in which specimens are prepared, perhaps even describing ultracentrifugation which is an A-level topic. This would have shown a greater depth of understanding and it is very useful to be able to link together topics in biology. Furthermore the candidate fails to conclude their work, you should always write a conclusion even for a short essay like this. It allows you to draw the essay to a close and leave the reader with a good impression. A good conclusion consists of a summary of your key points, you should include reasons for why these points are important, this helps the reader to see that your essay is important and is worth reading.

Quality of writing

Spelling and grammar are fine throughout. However, despite the fact that the candidate accurately describes both microscopes they use very few technical terms, I would expect an A-level candidate to include terms such as photomicrograph which is the image produced on screen from an electron microscope. In addition to this, the candidate consistently uses the term ‘light microscope’ and it is more accurate to say ‘optical microscope’ which is the scientific name.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by pictureperfect 03/07/2012

Read less
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

    An Essay about Microscopes

    3 star(s)

    Robert Hooke Known as the "English Father of the Microscope" was more in to improving the design and capabilities There are two types of modern Microscopes the Compound Light Microscope and the Electron Microscope. The light Microscopes that modern sciences use today are a lot more powerful, sophisticated and widely available at low cost.

  2. Peer reviewed

    Comparing the Light and Electron Microscope

    3 star(s)

    Where electrons penetrate, the screen appears bright. These areas are termed electron transparent. As electrons have a very small mass, they do not easily penetrate materials and so the sections need to be exceedingly thin. This sectioning creates a flat image and the natural contouring of a specimen cannot be seen, to overcome this, the SEM was developed.

  1. Peer reviewed

    Describe the principles and limitations of transmission and scanning electron microscopes. Specific reference should ...

    3 star(s)

    the specimen must be dehydrated .Another big problem is that the specimen must be subjected to severe treatment involving corrosive chemicals and physical shock.This may alter the actual appearance of the cells.Any deviation from the real appearance of cells is known as an artefact.There could be a deviation in the

  2. Peer reviewed

    Electron microscopes.

    3 star(s)

    are seen. This microscope allows us to see as separate structures, particles which are as close together as 2 nanometres, thus the resolution of this microscope is about 2 nanometres. Because of its high-resolution power the electron microscope can be used at low as well as high magnification.

  1. Refraction of Light Lab Report

    Rays must be shone at the center of the flat surface because if not, the light would be reflected more than it will refract. d. The angle of refraction is smaller than the angle of incidence. e. The ratio for all angles of incidence greater than zero was precise.

  2. In this experiment I will be investigating the efficiency of a motor. I hope ...

    * Set up the circuit as shown in the diagram * Check with teacher that it is correct * Start with lowest weight and increase until all ten weights have been used * Time how long each weight takes to reach the top of the bench * Then repeat the

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

    Also I must use the same diameter and focal length lens; lenses with different focal lengths will of course have different powers. First Experiment * Power pack set to 9 Volts * Using a filament lamp as light source * Distance the U value decreases per stage is 50mm U (x10-3 M)

  2. The History, Development and Use of the Light and Electron Microscope.

    Eventually the microscope had revolutionised people's way of thinking and the design of the microscope reached a point of faultlessness. Viewers were able to see live specimen and make conclusions on the object's structure and function. Below is how you prepare the specimen for an optical microscope and an electron microscope: 1.

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