Types of Microscope
Types of Illumination
One of the most important and useful instruments for students in any Biology or related laboratory is a microscope. It magnifies the sample which is otherwise non-visible via naked eyes like micro-organisms. A typical microscope also known as the compound microscope has an eyepiece (ocular) through which you see the sample. The ocular lens magnifies the image produced by objective lenses 5X or 10X times for example. Laboratory microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces. The Body tube holds the eyepiece and the objective lens while the arm is the curved structure which holds the body tube in place. Coarse and fine adjustment knobs adjust the position of the body tube. Objectives hold high or low power lenses (4X, 45X, 60X or 100X for example). Objectives can be changed through a revolving nose-piece. The stage is the flat surface, which holds the sample and a glass microscopic slide can be adjusted via stage clips. The mirror/lamp increases the light shining through the sample and a condenser concentrates and controls this light. Some microscope can be connected to a computer system via USB and have a digital camera that can be used for imaging and analysis via Micro Image Analysis software.
A compound microscope has a single optical path while a Stereomicroscope (zoom stereo or dissecting microscope) has two different optical paths which serve for the depth perception and three-dimensional viewing. It is ideal for viewing rocks, crystals, insects, worms and dissection specimens, etc.
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