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Problem Analysis:

The image provided is a worksheet about microscopes, including labeling parts of a microscope and answering questions related to its use. Below, I will solve the problems step by step.

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Part 1: Labeling the Microscope

The diagram shows a compound light microscope with various labeled parts. Here are the correct labels for each part:

1. Eyepiece (Ocular Lens)
- The lens you look through to view the specimen.

2. Arm
- The part that connects the head to the base and provides support.

3. Head/Body Tube
- Connects the eyepiece to the objective lenses.

4. Objective Lenses
- The lenses closest to the specimen, which provide magnification.

5. Nosepiece (Turret)
- The rotating part that holds the objective lenses.

6. Stage Clips
- Hold the slide in place on the stage.

7. Stage
- The flat platform where the slide is placed.

8. Base
- The bottom part of the microscope that provides stability.

9. Illuminator/Light Source
- Provides light to illuminate the specimen.

10. Diaphragm/Aperture Wheel
- Controls the amount of light passing through the specimen.

11. Condenser
- Focuses light onto the specimen.

12. Coarse Adjustment Knob
- Used for large adjustments in focus.

13. Fine Adjustment Knob
- Used for precise adjustments in focus.

14. Foot/Stand
- Supports the entire microscope.

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Part 2: Microscope Use Questions

#### Question 15:
> When focusing a specimen, you should always start with the ________ objective.

- Answer: Low-power objective
- Explanation: Starting with the low-power objective ensures that you can easily locate the specimen under the microscope. Once located, you can switch to higher magnifications for detailed observation.

#### Question 16:
> When using the high power objective, only the ________ knob should be used.

- Answer: Fine adjustment knob
- Explanation: After switching to the high-power objective, the coarse adjustment knob is no longer needed because it may cause the specimen to move out of view. The fine adjustment knob allows for precise focusing without moving the specimen too much.

#### Question 17:
> The type of microscope used in most science classes is the ________ microscope.

- Answer: Compound light microscope
- Explanation: Compound light microscopes are commonly used in science classes because they are effective for viewing thin, transparent specimens by passing light through them.

#### Question 18:
> You should carry the microscope by the ________ and the ________.

- Answer: Arm and Base
- Explanation: To avoid damaging the microscope, it should be carried by holding the arm with one hand and supporting the base with the other hand. This ensures stability and prevents tipping.

#### Question 19:
> The objectives are attached to what part of the microscope (it can be rotated to click lenses into place)?

- Answer: Nosepiece (Turret)
- Explanation: The nosepiece is the rotating part that holds the objective lenses. It allows you to switch between different magnifications by clicking the desired lens into place.

#### Question 20:
> A microscope has an ocular objective of 10x and a high power objective of 50x. What is the microscope's total magnification?

- Answer: 500x
- Explanation: The total magnification of a microscope is calculated by multiplying the magnification of the ocular lens by the magnification of the objective lens.
\[
\text{Total Magnification} = \text{Ocular Magnification} \times \text{Objective Magnification}
\]
\[
\text{Total Magnification} = 10 \times 50 = 500
\]

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Final Answers:

1. Eyepiece (Ocular Lens)
2. Arm
3. Head/Body Tube
4. Objective Lenses
5. Nosepiece (Turret)
6. Stage Clips
7. Stage
8. Base
9. Illuminator/Light Source
10. Diaphragm/Aperture Wheel
11. Condenser
12. Coarse Adjustment Knob
13. Fine Adjustment Knob
14. Foot/Stand

15. Low-power objective
16. Fine adjustment knob
17. Compound light microscope
18. Arm and Base
19. Nosepiece (Turret)
20. 500x

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Boxed Final Answer:

\[
\boxed{500x}
\]