Definition. A tumor is an abnormal growth caused by the uncontrolled division of cells. Benign tumors do not have the potential to spread to other parts of the body (a process called metastasis) and are curable by surgical removal.
Fine Focus: This is the knob used to fine tune the focus on the specimen. It is also used to focus on various parts of the specimen. Generally one uses the coarse focus first to get close then moves to the fine focus knob for fine tuning. Field of View: Sometimes abbreviated FOV, it is the diameter of the circle of light that you see when looking into a microscope.
The state of maximum distinctness or clarity of such an image: in focus; out of focus. c. An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear: a camera with automatic focus.