"Microscope and Telescope" Lens and Its Application PPT Teaching Courseware

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"Microscope and Telescope" Lens and Its Application PPT Teaching Courseware

The first part: sorting out new knowledge

1. Microscope

1. Structure of a microscope: As shown in Figure 5-5-1A, the structure of a microscope from bottom to top is mainly a reflector, slide, objective lens and eyepiece. Both objective lenses and eyepieces are ______ lenses.

2. Working principle of a microscope: The object being observed on the slide passes through the objective lens and forms a _____ real image. The real image is just within the focus of the eyepiece, and passes through the eyepiece to form a _____ virtual image. (Choose "zoom in" or "zoom out" for both)

[Expansion]A microscope actually magnifies an object twice to form an image. The magnification of the microscope is the product of the magnification of the eyepiece and the magnification of the objective lens, so it can be used to see tiny objects clearly.

2. Telescope

1. The structure of the telescope: The telescope is composed of ______ mirror and ______ mirror. In the telescope shown in Figure A, both the objective lens and the eyepiece are ______ lenses.

2. Working principle of a telescope: The objective lens of a simple astronomical telescope is used to make distant objects form a ______ real image near the focus. The eyepiece is equivalent to a ______ mirror, which magnifies the real image.

Three perspectives

1. The angle of view is the angle formed by the light rays drawn from both ends of the object at the center of the human eye, as shown in Figure 5-5-3. The larger the viewing angle, the more ______ the image formed on the retina.

2. The size of the angle of view formed by an object to the eye is not only related to _______________, but also related to ____________.

4. Exploring the Universe

1. There are many galaxies like the Milky Way in the universe. The sun is a ________ in the Milky Way, and the earth is a ________ in the third orbit closer to the sun.

2. The propagation speed of light is 3×105 km/s. The distance that light travels in one year is __________km, which is called 1 light year. It is known that the time required for light to travel through the Milky Way is 100,000 years, then the diameter of the Milky Way is approximately __________km.

Microscope and Telescope PPT, Part 2: Application Examples

Type 1 Structure and Principle of Microscope

Example 1: The objective lens and eyepiece of a microscope play the role of ()

A． Camera and magnifying glass B. Projector and magnifying glass

C. Magnifying glass and camera D. Magnifying glass and projector

[Summary of rules]The characteristics and functions of the objective lens and eyepiece in a microscope: the objective lens has a smaller focal length and forms an inverted, magnified real image; the eyepiece lens with a larger focal length produces an upright and magnified virtual image.

Type 2: Structure and Principle of Telescope

Example 2: Figure 5-5-5 shows the internal structure of a simple astronomical telescope. The object in the distance passes through the objective lens and forms a ____________ real image, which falls at the position of the eyepiece ____________; this real image passes through the eyepiece and forms a _______________ image, and the observer can see the distant object clearly. This is the principle of the telescope. . If you want to make a simple astronomical telescope and there is no ready-made lens, you can choose a suitable _______ (optional "near-sighted" or "far-sighted") lens instead.

[ Analysis Inside, an upright, magnified virtual image is formed through the eyepiece. The objective lens and eyepiece of a simple astronomical telescope are both convex lenses, so they can be replaced with far-sighted lenses.

[ Summary of rules] In microscopes and telescopes composed of two sets of convex lenses, the objective lens forms an inverted real image, and the eyepiece forms an upright virtual image. Therefore, the image seen by the eyes is actually inverted compared with the original object.

Microscope and Telescope PPT, Part 3: Class Feedback

1. (Multiple choice) Among the following optical instruments, which one can change the size of the image ()

A． telescope b. Magnifying glass C． microscope d. Plane mirror

2. The instrument used to observe human oral epithelial cells in the laboratory is ()

3． Regarding the eyepieces and objective lenses on biological microscopes, which of the following statements is correct ( )

A． They are all convex lenses

B. They are all concave lenses

C. The eyepiece is a convex lens and the objective lens is a concave lens

D. The eyepiece is a concave lens and the objective lens is a convex lens

4. A telescope composed of two sets of convex lenses. Regarding the imaging principle of its objective lens and eyepiece, which of the following statements is correct ()

A． The imaging principle of an objective lens is similar to that of a magnifying glass

B. The imaging principle of the objective lens is similar to the imaging principle of the camera lens

C. The imaging principle of the objective lens is similar to the imaging principle of the projector lens

D. The imaging principle of the eyepiece is similar to the imaging principle of the projector lens

5. The first person to point a telescope into the sky was an Italian physicist ()

A． Newton b. Galileo

C. franklin d. Kepler

6. When the human eye looks at the same object, there will be a phenomenon of "larger near and smaller at far", which is related to the size of the angle of view between the object and the human eyes, as shown in Figure 22-2. The farther the same object is from the human eye, the _____ the angle of view becomes. When a person is at the same distance from objects of different sizes, the viewing angle will be different. The larger the object, the more ______ the viewing angle. (Choose "big" or "small" for both)

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For more information about the "Lens and Its Applications Microscopes and Telescopes" PPT courseware, please click the Lenses and Their Applications ppt Microscopes and Telescopes ppt tag.

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Update Time: 2024-09-02

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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