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

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

1. Understand the microscope

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

Shutter

The lighting part of the microscope

Function: Adjust the light passing through the light hole

reflector

The lighting part of the microscope

Function: Reflect light

There are plane mirrors and concave mirrors (to gather light and increase brightness)

converter

Mechanical part of the microscope

Function: Place and convert the objective lens

1. Take the mirror and place it

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

2. Aiming at the light

Turn the converter to align the low-magnification objective lens with the light hole (be careful not to pull the objective lens with your hands!)

3. Observe

(1) Place the specimen on the stage, press it down, and face the light hole.

(2) Lower the lens tube first until it is close to the specimen.

(3) 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 image clearly. Then turn the fine focus screw slightly to make the object image you see clearer.

think:

1. What do the objects you observe look like?

2. If the image is to the left, in which direction should you move the specimen to center the image?

3. Can you observe the internal structure of a dead ant or a piece of hair by placing it in the center of a glass slide with tweezers?

Precautions

1. Hold it with your right hand and hold it with your left hand

2. When rotating the converter, place your fingers on the edge of the converter and do not use your fingers to hold the objective lens to rotate.

3. After the light alignment is completed, the reflector cannot be moved again.

4. When the lens barrel is lowered, your eyes must be looking at the objective lens. When observing, both eyes must be opened at the same time.

5. Do not wipe the eyepiece and objective lens directly with your hands or cloth

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 __________. Gaze into _______ with your ____ eyes, open your ____ eyes, and then adjust _________ with your hands until you see a bright field of vision.

3. 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.

6. If the object image is to the left, you should move the specimen to _____ to center the object image.

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Update Time: 2024-11-22

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

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