Final answer:
Field of view (FOV) defines the area visible through optical instruments like microscopes and telescopes, essential for determining object sizes.
Explanation:
Field of view (FOV) refers to the total area visible through the eyepiece of optical devices such as telescopes, microscopes, and cameras. It is the angular extent of what can be seen and varies depending on the instrument used. In microscopy, understanding the FOV is crucial for calculating the actual size of observed objects based on magnification.
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