Assignment+1

Poster – Types of Microscopes   There are four main types of microscope: **Compound microscopes, stereo or dissecting microscopes, transmission electron microscopes and scanning electron microscopes.** Your task is to produce a poster that describes and explains each type of microscope. You should include the following information if you can find it all: 1. Who invented this type of microscope? 2. When was it invented? 3. What is it used for?

Remember that this is a poster – it should have more picture than words. Your poster should be no larger than A3 in size.

There is a Gallery of student electronic work at Microscope Poster Gallery

Criteria for assessment

All 4 microscopes included (4 marks) Information correct for each type of microscope (12 marks) Presentation of poster (4 marks) - good diagrams/pictures - not too many words - neat and clear layout  //**Below is my poster for the different types of microscopes**//   __**//Compound Microscopes://**__ 1. Zaccharias Janssen (and his father Hans) invented the compound microscope. 2. The compound microscope was invented sometime around the year 1590. 3. Compound Microscopes are designed with a compound lens system. The objective lens provides the primary magnification which is multiplied by eyepiece. Visual information from compound microscopes is two dimensional, whereas those produced by stereomicroscopes are three dimensional. Most microscopes provide an image which is upside down and backward as compared to the actual orientation of the object. Compound microscopes may be upright or inverted. There are a variety of microscopy techniques available for compound microscopes**.**
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<span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">Stereo or Dissecting Microscopes: <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">1. <span style="color: black; display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">August Koehler invented the stereo microscope. <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">2. The stereo microscope was designed around 1600. <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">3. The image from a stereo or dissecting microscope can be captured by normal light-sensitive cameras to generate a micrograph. Originally images were captured by photographic film but modern developments in CMOS and later CCD cameras allow the capture of digital images.

<span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">Transmission Electron Microscopes: <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">1. It was Co-invented by Germans, Max Knoll and Ernst Ruska. <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">2. The introduction of the electron microscope was in the 1930's. <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">3. The transmission electron microscope operates on the same basic principles as the light microscope but uses electrons instead of light. What you can see with a light microscope is limited by the wavelength of light. TEMs use electrons as "light source" and their much lower wavelength makes it possible to get a resolution a thousand times better than with a light microscope.

<span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">Scanning Electron Microscopes: <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">1. <span style="color: black; display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">Sir Charles Oatley invented the SEM. <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">2. <span style="color: black; display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt; line-height: 115%;">It was invented in 1952. <span style="color: windowtext; display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt;">3. The Scanning Electron Microscope is a microscope that uses electrons rather than light to form an image. The SEM has a large depth of field, which allows a large amount of <span style="display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt;">what you are looking at <span style="color: windowtext; display: block; font-family: 'Aparajita','sans-serif'; font-size: 14pt;">to be in focus at one time. The SEM also produces images of high resolution. Preparation of the samples is quite easy since most SEMs only require the sample to be conductive. The combination of higher magnification, larger depth of focus, greater resolution, and ease of sample observation makes the SEM one of the most heavily used instruments in research areas today.