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The compound light microscope is one of the most commonly used types of microscope. Among its many uses is the science classroom, where they are an affordable and easy to use instrument for learning biology and chemistry. The instrument traces back generations, but recently has evolved into a very modern instrument.
Only a few decades ago, you could find the microscope in just two basic types. There was the monocular compound microscope and the binocular compound. That is, the compound light microscope came with either one or two viewing units. With the monocular compound, there was a single eyepiece and so you looked at your specimen with just one eye. This is still what many people envision when they hear the word "microscope." Then there's the binocular model which, naturally, resembles a pair of binoculars. That's because there are a pair of viewing units, one for each eye. Today, there are few if any monocular compound microscopes made. The new standard is the binocular.
However, even more recent times have introduced to us a newer standard. This is the trinocular compound microscope. The "tri" signifies a third viewing port. This makes it a not-as-common spin-off of the binocular compound.
The function of the trinocular microscope is a bit different, since most people only have two eyes. The third eyepiece, then, is for use by a second person. It comes in handy in a couple of situations. First, if two people need to consult together over the same specimen, they are able to look at it at the same time. A second and more common use of the trinocular is to allow a science instructor to see the same thing that his student sees under the microscope. A third good use for it is to take pictures of the specimen with a camera placed over the third eyepiece. Each of the microscope parts functions in harmony, allowing the camera to see what the person's eye sees.
