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Microscopes are instruments used to observe small objects that cannot be seen by the naked eye. Often, these objects are microscopic organic life forms such as small animals or plants or cellular components such plant and animal cells and issues. These objects can be viewed either through prepared slides or through live samples suited for microscope viewing.
There are four main parts of the microscope. These are the ocular eye piece, the objective lenses, the adjustment knobs and the light source. The ocular eye piece is the part where the user observes the specimen, the objective lenses magnify the images, and the light source provides the light needed by the user to observe the specimen. The adjustment knobs help focus the lenses to attain a clear image. Different variations and improvements made to these main parts results in the formation of different microscope types we see today, primarily the light microscope and the electron microscope.
The most common and simplest type of microscope is the light microscope that requires a light source to use. Many light microscopes do not have its own light source, using a mirror to focus light from an external source to focus it on the image. More expensive models have a built-in light source that results into clearer images. This type of microscope is commonly seen in school and university laboratories or for other general applications outside the lab since they are easy to use and are affordable.
Electron microscopes are more advanced than light microscopes, using superior objective lenses and light source, using a beam of electrons to see the specimen. The objective lens use have more magnifying power, further revealing smaller structures that are not visible under light microscopes. There are different types of electron microscopes for different purposes, almost all of them for medical applications and high level research in laboratories.
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