"Laws of Imaging by Convex Lenses" Lenses and their applications PPT download

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"Laws of Imaging by Convex Lenses" Lenses and their applications PPT download

Part One Content: Basic Knowledge Key Points

Knowledge points: The rules of imaging by convex lenses

1. Analyzing the rules of convex lens imaging shows:

(1) The dividing point of whether an object becomes a real image or a virtual image through a convex lens is 1 times the focal length; the dividing point of whether an object becomes a reduced image or an enlarged image through a convex lens is 2 times the focal length;

(2) When the object becomes a real image, the image is always inverted; when it becomes a virtual image, the image is always upright (please fill in "inverted" or "upright");

(3) When a convex lens forms a real image, when the object is close to the lens, the image moves away from the lens, and the image becomes larger; when it forms a virtual image, when the object moves closer to the lens, the image moves closer to the lens, and the image becomes smaller.

2. The focal length of a certain convex lens is 10 cm, and the object is placed 15 cm away from the convex lens. When the object is moved 30 cm away from the lens, its image becomes smaller and the distance from the image to the lens becomes smaller (choose "get bigger" or "get smaller").

3. When using a certain convex lens to study its imaging rules, some experimental information obtained by a student is as shown in the table. According to the information in the table, the focal length of the convex lens is 15 cm; when v=24 cm, the convex lens forms a reduced image. The camera (optional "projector" or "camera") is made based on this principle.

4. (Liangshan Prefecture High School Entrance Examination) In an experiment to explore the imaging rules of a convex lens, when the candle moves to a distance of 20 cm from the convex lens, if the focal length of the convex lens is 10 cm, then move the light screen on the other side of the convex lens until the light screen A clear image of the candle flame is obtained. The nature of this image is an inverted, equal-sized real image.

5. There is a convex lens. When the object is placed 15 cm away from the lens, it forms a magnified real image; when the object is placed 8 cm away from the lens, it forms a magnified virtual image. Then the focal length of this convex lens cannot be equal to (A)

A.8 cm B.10 cm

C.11 cm D.14 cm

PPT on the rules of convex lens imaging, part 2: improvement of comprehensive capabilities

6. (Chengdu High School Entrance Examination) In an experiment to explore the imaging rules of convex lenses, the imaging situation of a certain experiment is as shown in the figure. The team members raised the question "What methods can make the image on the light screen larger?" After discussion, they formed Both options can achieve their goals. Option 1: Keep the position of the candle and the light screen stationary, and only move the convex lens to the left by an appropriate distance; Option 2: Keep the position of the convex lens stationary, and move both the candle and the light screen to the right.

7. A piece of paper with letters printed on it is observed through a lens as shown in the figure. It can be seen from the figure that the lens is a convex lens, and the nature of the image formed is an inverted, reduced real image. The distance from the paper to the lens is greater than 2 times Focal length (optional "greater than 2 times the focal length", "greater than 1 times the focal length and less than 2 times the focal length", "equal to 1 times the focal length" or "less than 1 times the focal length").

8. As shown in the figure is the relationship between the image distance v and the object distance u of the convex lens obtained by Xiaowei through experiments. It can be seen from the figure (B)

A. The focal length of the convex lens is 20 cm

B. The focal length of the convex lens is 10 cm

C. When an object approaches a convex lens, the distance between the image and the convex lens becomes smaller.

D. The imaging characteristics when the object distance is 40 cm can be applied to projectors

9. (Xianning High School Entrance Examination) The focal length of a convex lens is 15 cm. When the lit candle is moved from 40 cm away from the convex lens to 20 cm along the main optical axis, the changes in the size and image distance of the image are (A)

A. The image becomes larger and the image distance becomes larger

B. The image becomes smaller and the image distance becomes smaller

C. The image becomes larger and the image distance becomes smaller

D. The image becomes smaller and the image distance becomes larger

10. In the experiment of "Exploring the Imaging Rules of Convex Lenses", as shown in the figure, a clear image was obtained exactly on the light screen. Which of the following statements is correct (C)

A. At this time, an upright and reduced real image is formed on the light screen.

B. Using this imaging principle, a projector can be made

C. If the positions of the candle and the light screen are interchanged, an enlarged image can be observed on the light screen

D. In order to facilitate the observation of images on the light screen from different directions, a glass plate with a smooth surface should be used as the light screen.

11. When "Exploring the rules of imaging of convex lenses", place the lit candle 30 cm away from the convex lens, and obtain a clear image of the candle flame on the light screen 16 cm away from the lens on the other side of the lens. Which of the following related statements is correct (B)

① An inverted, magnified real image is formed on the light screen ② The camera works using this imaging principle ③ The focal length f of the convex lens must satisfy 8 cm

A. Only ① and ③ B. Only ② and ③ C. Only ② and ④ D. Only ① and ④

PPT on the rules of convex lens imaging, part 3: Expansion of research and breakthroughs

14. Xiao Ming used the device as shown in the picture to "explore the imaging rules of convex lenses" experiment:

(1) If the focal length of the convex lens is 10 cm, when the candle flame is 15 cm away from the convex lens, an inverted, magnified real image can be formed; in cameras and projectors, the imaging situation is similar to this in projectors. When the candle flame moves to the right (closer to the lens), to form a clear image on the light screen, the light screen needs to be moved to the right (optional "left" or "right");

(2) During the experiment, use black paper to cover half of the convex lens, and the shape of the image remains unchanged (optional "change" or "no change");

(3) Xiaojun also used another convex lens with a focal length of 15 cm to do the experiment. Keep the object distance at 40 cm in both cases, and move the light screen until the clearest image is obtained on the light screen. Then Xiaojun (optional) The lens used by "Xiao Ming" or "Xiao Jun") produces a larger image; if these two lenses are used as magnifying glasses and are at the same distance from the textbook on the table, then Xiao Ming (optional "Xiao Ming" or "Xiao Jun") The lens used produces a large image;

(4) When Xiao Ming’s class took graduation portraits, the photographer found that there were classmates on both sides who had not entered the viewfinder. The photographer should move the camera away from (optional "closer" or "far away") the classmates, and at the same time shorten (optional) Only by "increasing", "shortening" or "not changing") the length of the camera obscura can you get a clear and satisfactory picture in the viewfinder.

Keywords: Free download of PPT courseware for eighth grade physics volume 1 of the People's Education Press, PPT download of the rules of imaging by convex lenses, PPT download of lenses and their applications, .PPT format;

For more information about the PPT courseware "Lens and its application and the rules of convex lens imaging", please click the "Lens and its application ppt rule of convex lens imaging" ppt tag.

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Update Time: 2024-08-31

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