"Practice using a microscope" Cells are the basic unit of life activities PPT courseware 6

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"Practice using a microscope" Cells are the basic unit of life activities PPT courseware 6

1. Understand the microscope

Microscopes are commonly used instruments for exploration, and the main ones commonly used in middle schools are monocular optical microscopes.

2. Use of microscope

Watch the "Using a Microscope" video to summarize the steps for using a microscope

a. Taking the mirror and placing it

Hold it in your right hand and hold it in your left hand.

Raise the lens barrel and install the objective lens.

b. Aiming at light

There are two types: plane mirror (used when the light is strong) and concave mirror (used when the light is weak).

c. Observe

Turn the coarse focus screw to slowly lower the lens barrel until the objective lens is close to the slide specimen (at this time, your eyes must be looking at the objective lens).

When observing:

(1) First fall and then rise.

The lens tube is lowered first until it is close to the specimen. rear focus

【Don't (things) fall, don't (eyes) rise】

(2) First thick and then thin. Look at the eyepiece with your left eye, open your right eye, and turn the coarse focusing screw counterclockwise to slowly raise the lens barrel until you can see the object clearly. Then turn the fine focus screw slightly to make the object image you see clearer.

Step 3 of using a microscope

Work in groups of two to complete observations

After observation, complete the content of "Learning Task 3" of the tutorial plan

Time: three minutes

can you answer

1. What do the objects you observe look like?

2. If the specimen is moved to the left, in which direction will the object image move?

Consolidation exercises:

1. When using a microscope, you should use one hand to hold the microscope and the other to hold it in a ___ position on your experimental table, and then install it __________.

2. When aiming at the light, turn the converter so that the ____ magnification mirror is aligned with ________, and turn the shutter so that a larger _________ is also aligned with __________. Look into _______ with ____ eyes, open ____ eyes, and then adjust _________ with your hands. If the light is dark, use ________. If the light is strong, use ________. Until you see a bright view.

3. Place the slide specimen to be observed on the ________, press it with ______, and the specimen should be facing the center of _______.

Turn the ___ focusing screw to lower the lens barrel _______ until the objective lens is close to the slide specimen.

4. Why must the eyes look at the objective lens at this time?

because__________________________

5. Turn the ____ focus screw in the ____clockwise direction to slowly raise the lens barrel until the object image is clearly visible. Then turn the ____ focusing screw slightly to make the object image you see clearer.

Use your brain

A stain appears in the microscope field of view. Is there any way you can tell whether the stain is on the objective or the eyepiece? Or on a slide specimen?

Move the slide while observing. If the dirt moves with it, the dirt is on the slide;

Rotate the eyepiece while observing. If the dirt also rotates, it means the dirt is on the eyepiece;

If you have tried all the above and the dirt does not rotate, then the dirt is on the objective lens.

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"Practice using a microscope" Cells are the basic units of life activities PPT courseware 5:

"Practice using a microscope" Cells are the basic units of life activities PPT courseware 5 1. Understanding microscopes Microscopes are commonly used instruments for exploration, and the main ones commonly used in middle schools are single-cylinder optical microscopes. Shutter, the illumination part of the microscope. Function: to adjust the light passing through the light hole.

"Practice using a microscope" Cells are the basic units of life activities PPT courseware 4:

"Practice using a microscope" Cells are the basic units of life activities PPT courseware 4 Self-study guide 1 1. Refer to textbook P37 to name and function each part of the microscope. What is the magnification of a microscope? The magnification of the microscope = the magnification of the objective lens.

"Practice using a microscope" Cells are the basic units of life activities PPT courseware 3:

"Practice using a microscope" Cells are the basic units of life activities PPT courseware 3 Learning objectives: 1. Explain the structure and function of the microscope. 2. Use a microscope to observe clear images. 3. Recognize the standard operating methods of the microscope and take good care of the microscope. Self-study..

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Update Time: 2024-08-02

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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