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Observing in Biology Index
Observing very small specimens and Calculating the
WORKING IN THE LABORATORY
Observing in Biology
Many of the interesting things in biology are very small and delicate. Our eyes need help to be able to see them properly. Our fingers are too big so we need tools to handle them carefully.
Using a binocular microscope
The binocular microscope usually magnifies by x20. We use both eyes which gives us a clear three-dimensional view.
To use the binocular microscope follow the instructions:
First choose the background that you want to use. A dark specimen is more easily observed against a white background and a pale specimen is more easily observed against a black background.
Put your specimen under the microscope and illuminate it with a bench lamp. Raise the microscope until you can see the specimen approximately in focus. Now lock the microscope in place. Finally focus precisely, using the focusing knob.
You may also find that the eye-pieces of your binocular microscope are too far apart or too close together. These can be moved to suit your eyes.
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