Fill in the blank. _______is used for precise focusing.

The fine adjustment knob is used for precise focusing.

• When using a microscope, focusing on the specimen is imperative to observe the details clearly. Generally, there are two types of adjustment knobs on a compound microscope: the coarse adjustment knob and the fine adjustment knob.
• The coarse adjustment knob is bigger and is used to bring the object into the general field of view by moving the stage (where the specimen is placed) or the objective lenses (the magnifying lenses closest to the specimen) significantly. It's particularly useful when you first place the slide on the microscope and need to get the specimen into view.
• Once the image is in rough focus using the coarse adjustment knob, the fine adjustment knob becomes essential. It moves the stage or objective lenses by much smaller increments. This allows you to hone in on the specimen and get a sharp, clear image. This is especially important at higher magnifications, where the depth of focus becomes very shallow, and even minor adjustments can have a significant impact on clarity and focus.