what is the function of the fine adjustment knob on a microscope

The fine adjustment knob on a microscope is used to make small adjustments to the focus of the microscope. When focusing on an object, the coarse adjustment knob is used first to perform significant stage position adjustments before focusing on the object. The fine adjustment knob is then used to bring the object into focus by moving the stage closer to the target. The fine adjustment knob moves the stage more slowly and precisely than the coarse adjustment knob, allowing for better control and more gradual adjustments. It is typically used when viewing objects at higher magnifications.