2. Why should you never use the coarse adjustment knob on high power? __

## Step 1<br />The coarse adjustment knob on a microscope is used to make large adjustments to the focus of the specimen. This is done by moving the stage or the objective lens.<br /><br />## Step 2<br />When using high power objectives, the depth of field is very shallow. This means that even a slight movement can cause the specimen to go out of focus or even damage the slide or the objective lens.<br /><br />## Step 3<br />Therefore, it is recommended to use the fine adjustment knob when focusing under high power. This allows for more precise adjustments without the risk of damaging the slide or the objective lens.