1. what lens structure 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 carry the microscope?
8. how should you clean the microscope?
9. how can you prevent your slide from slipping on the stage?

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Accepted Answer

To answer these microscope - related questions, we analyze each one based on microscope principles:

### Question 1
# Brief Explanations:
To focus on the specimen, first, start with the **low - power objective lens** (usually 4x or 10x). This is because the low - power lens has a larger field of view and a greater depth of field, which makes it easier to locate the specimen initially. After getting a rough focus with the low - power lens, you can then switch to higher - power lenses for more detailed observation.
# Answer:
The low - power objective lens (e.g., 4x or 10x) is used first to focus on the specimen as it has a larger field of view and depth of field, making it easier to locate the specimen.

### Question 2
# Brief Explanations:
The coarse adjustment knob is used for large - scale focusing adjustments, usually when using the low - power objective lens to get the specimen roughly in focus. However, when using the high - power objective lens, the working distance (the distance between the lens and the specimen) is very small. If you use the coarse adjustment knob, you run the risk of crashing the high - power lens into the specimen, which can damage both the lens and the slide. So, we use the fine adjustment knob for precise focusing at high power.
# Answer:
We never use the coarse adjustment knob on high power because the working distance is very small at high power, and using the coarse adjustment knob may cause the high - power lens to crash into the specimen, damaging the lens and the slide.

### Question 3
# Brief Explanations:
The fine adjustment knob is used for making small, precise adjustments to the focus. After getting a rough focus with the coarse adjustment knob (at low power) and then switching to a higher - power lens, the fine adjustment knob is used to bring the specimen into sharp focus. It allows for very small changes in the distance between the objective lens and the specimen, which is necessary for getting a clear image at higher magnifications.
# Answer:
The fine adjustment knob is used to make small, precise adjustments to the focus, especially at high magnifications, to get a sharp image of the specimen.

### Question 4
# Brief Explanations:
Most compound microscopes have three objective lenses. The **scanning objective lens** (usually 4x) has the lowest magnification and the largest field of view. The **low - power objective lens** (usually 10x) provides a moderate level of magnification and is used for initial focusing. The **high - power objective lens** (usually 40x or 100x for oil immersion) provides high magnification for detailed observation. The powers (magnifications) of these lenses are typically 4x, 10x, and 40x (or 100x for oil immersion).
# Answer:
A compound microscope typically has three objective lenses: the scanning objective (e.g., 4x), the low - power objective (e.g., 10x), and the high - power objective (e.g., 40x or 100x for oil immersion). Their powers (magnifications) are usually 4x, 10x, and 40x (or 100x).

### Question 5
# Brief Explanations:
The magnification of the ocular (eyepiece) lens in a typical compound microscope is usually 10x. However, some microscopes may have ocular lenses with magnifications like 5x or 15x, but 10x is the most common. The ocular lens works in combination with the objective lenses to determine the total magnification of the microscope (Total magnification = Magnification of objective lens×Magnification of ocular lens).
# Answer:
The magnification of the ocular (eyepiece) lens is typically 10x (though it can be 5x or 15x in some cases). It combines with the objective lens magnification to give the total magnification.

### Question 6
# Brief Explanations:
The short - term objectives (the objective lenses) are also called the **objective lenses** or the "object - side lenses". Their main function is to magnify the specimen. Each objective lens has a different magnification power, and they are responsible for the initial magnification of the specimen before the light carrying the image of the specimen reaches the ocular lens.
# Answer:
The short - term objectives are called the objective lenses. Their function is to magnify the specimen.

### Question 7
# Brief Explanations:
To calculate the total magnification of the microscope, we use the formula: Total magnification = Magnification of the objective lens×Magnification of the ocular (eyepiece) lens. For example, if the objective lens has a magnification of 10x and the ocular lens has a magnification of 10x, the total magnification is $10	imes10 = 100$x.
# Answer:
To calculate the total magnification, use the formula: $	ext{Total magnification}=	ext{Magnification of objective lens}	imes	ext{Magnification of ocular lens}$.

### Question 8
# Brief Explanations:
The diaphragm (or iris diaphragm) controls how much light passes through the specimen. It is located below the stage (in the sub - stage condenser). By adjusting the size of the aperture of the diaphragm, we can control the intensity and the angle of the light that reaches the specimen. More open diaphragm allows more light, and a more closed diaphragm allows less light. This helps in getting a well - lit and contrasted image of the specimen.
# Answer:
The diaphragm (iris diaphragm) controls how much light passes through the specimen. It adjusts the light intensity and angle to get a good - quality image.

### Question 9
# Brief Explanations:
To carry the microscope, we use the **two - handed carry method**. Place one hand on the **arm** of the microscope (the curved part that connects the base to the body tube) and the other hand on the **base** of the microscope. This method provides a stable and balanced way to carry the microscope, preventing it from tipping over or getting damaged.
# Answer:
To carry the microscope, place one hand on the arm of the microscope and the other hand on the base. This two - handed carry provides stability and prevents damage to the microscope.

### Question 10
# Brief Explanations:
To prevent the slide from slipping on the stage, we use the **stage clips**. The stage clips are attached to the stage of the microscope. We place the slide under the stage clips and then tighten the clips (if they are adjustable) to hold the slide firmly in place. Some microscopes may also have a stage with a non - slip surface or a spring - loaded mechanism in the stage clips to ensure the slide stays in position during observation.
# Answer:
To prevent the slide from slipping on the stage, we use the stage clips to hold the slide firmly in place.

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