Question

1. what two structures on the microscope will you use to focus on your specimen? 2. why should you never use the coarse adjustment knob on high power? 3. when do you use the fine adjustment knob? 4. our microscopes have three objectives. what are their powers? 5. what is the magnification of the ocular lens? 6. what is the shortest objective called? 7. how do you switch objectives? 8. which structure controls how much light passes through the specimen? 9. how should you carry the microscope? 10. how can you prevent your slide from slipping on the stage?

Explanation:

1. The coarse - adjustment knob and fine - adjustment knob are used for focusing. The coarse one makes large adjustments and the fine one makes small, precise adjustments.
2. Using the coarse adjustment knob on high power can cause the objective lens to crash into the slide and damage both the lens and the specimen because it moves the stage in large increments.
3. The fine adjustment knob is used when you have already roughly focused with the coarse adjustment knob (usually on low power) and need to get a sharp, clear image, especially on medium or high - power objectives.
4. Common powers of microscope objectives are 4x (scanning), 10x (low - power), and 40x (high - power).
5. The magnification of the ocular lens is typically 10x.
6. The shortest objective is usually the scanning objective, often with a power of 4x.
7. Objectives are switched by rotating the nosepiece, which holds the objectives.
8. The diaphragm controls the amount of light passing through the specimen. It can be adjusted to increase or decrease the light intensity.
9. The microscope should be carried with one hand on the arm and the other hand supporting the base to ensure stability and prevent it from falling.
10. Slide clips on the stage can be used to hold the slide in place and prevent it from slipping.

Answer:

1. Coarse - adjustment knob, fine - adjustment knob
2. It can cause the objective lens to crash into the slide and damage them.
3. When you need to get a sharp image on medium or high - power objectives after rough focusing.
4. 4x, 10x, 40x
5. 10x
6. Scanning objective
7. By rotating the nosepiece.
8. Diaphragm
9. With one hand on the arm and the other hand supporting the base.
10. Use slide clips on the stage.