Sagot :
1. While looking at the objective lens and the stage from the side, turn the coarse focus knob so that the stage moves upward toward the objectives. ... The turn the fine adjustment knob, as necessary, for perfect focus.
2. It is located at the side of the microscope. It is located at the part for easy grip and adjustment
3. The optics of a microscope's lenses change the orientation of the image that the user sees. ... Similarly, if the slide is moved left while looking through the microscope, it will appear to move right, and if moved down, it will seem to move up. This occurs because microscopes use two sets of lenses to magnify the image.