At low power on the compound microscope, the diameter of the field of view is 4 millimeters. This is reduced to 1.7 millimeters when you switch to medium power and further reduced to 0.4 millimeters when you switch to high power. Covert the measurment for the field of view from millimeters to microns, the conventional unit of measurment in microscopy. There are 1000 microns in one millimeter.
Low power: 4mm= 4,000um
Medium power: 1.7mm= 1,700um
High power: 0.4mm= 400um
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Magnification is inversely proportional to the diameter of the field of view.
to determine the radius if you only have the diameter, you divided the diameter by 2. then there you have it ! you have the radius !
low
the diameter mutliplied by pi is the circumference. From a different view the circumference divided by diameter is pi.
Yes, a calibrated ocular micrometer can be used to measure the diameter or length of a field or object. Essentially, that is all that it is used for.