What is the field diameter of a microscope
When observing a microscope, the bright circular area seen is called the field of view, and its size is determined by the field diaphragm in the eyepiece.
The diameter of the field of view is also called the width of the field of view, which refers to the actual range of the inspected object that can be accommodated in the circular field of view seen under the microscope. The larger the diameter of the field of view, the easier it is to observe.
There is the formula F=FN/β
In the formula, F: field diameter, FN: field number (Field Number, abbreviated as FN, marked on the outside of the eyepiece barrel), β: objective lens magnification.
It can be seen from the formula:
(1) The diameter of the field of view is proportional to the number of fields of view.
(2) Increasing the multiple of the objective lens reduces the diameter of the field of view. Therefore, if you can see the whole picture of the inspected object under the low power lens, and change to a high power objective lens, you can only see a small part of the inspected object.
