"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT Courseware

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"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT Courseware

1. Observation and thinking

1. What kind of image can a convex lens make in life?

2. Observe the image of a convex lens

(1) Hold the convex lens and slowly move it from the table book to your eyes.

(2) Point the magnifying glass directly outside the window, and move the light screen back and forth on the other side of the magnifying glass to a relatively close position. Observe whether you can find the image of the scene outside the window on the light screen?

Think: What do you see? How many different situations are there?

2. Explore the rules of imaging by convex lenses

1. Research question: What is the relationship between virtuality and reality, bigness and smallness, uprightness and inversion of an image and the distance between objects?

2. Experimental program:

(1) Experimental equipment:

Convex lenses, candles, light screens, matches, light benches

(2) Two physical terms and adjustments before the experiment:

The centers of the candle flame, lens, and light screen are at the same level.

3． Conduct experiments and collect evidence

(1) Experimental steps

① Assemble the experimental device and adjust the center of the candle flame, the center of the convex lens and the center of the light screen to the same height.

② Fix the convex lens at a certain scale in the middle of the light bench, place the candle far away, so that the object distance u>2f, adjust the distance from the light screen to the convex lens, so that the candle flame forms a clear real image on the light screen. Observe the size and inversion of the real image. Record the object distance u and image distance v.

③ Move the candle closer to the convex lens, change the object distance u, still make u > 2f, follow the steps ② Do two more experiments, and observe the size and inversion of the real image respectively. Record the object distance u and image distance v.

④ Move the candle closer to the convex lens, change the object distance u so that f

⑤ Move the candle closer to the convex lens, change the object distance u so that f＜u＜2f, follow step ④ and do two more tests to observe the size and inversion of the real image respectively. Record the object distance u and image distance v.

⑥ Move the candle closer to the convex lens and change the object distance u so that u < f. The image of the candle cannot be obtained on the light screen. At this time, it becomes a virtual image. The image of the candle should be observed through the lens from the side of the light screen to observe the size of the virtual image. Hezheng fell.

3. Application

1. On what principle does a camera work?

The camera is made based on the principle that the distance between the object and the convex lens is greater than 2 times the focal length.

2. How does a slide projector work?

The slide projector is made based on the principle that the distance between the object and the convex lens is greater than the focal length and less than 2 times the focal length.

4. Class Summary

1. What are the rules of imaging by convex lenses?

2. What method did you use to obtain this pattern?

5. Feedback practice:

1. When doing an experiment on "Imaging Laws of Convex Lenses", a classmate placed a candle in front of a convex lens on a light bench, and then moved the light screen. However, no matter how he moved the light screen, he could not observe the image of the candle flame on the light screen. . Please analyze the possible reasons for this phenomenon.

2. (1) As shown in the picture, if you place the lit candle at ___, a reduced image will appear on the light screen; if you place the lit candle at _____, an enlarged image will appear on the light screen; place it on ____ _, there will be no image on the light screen.

(2) As the object distance continues to decrease, the image distance continues to _____, and the image size continues to ______; when the object distance is less than _____, no matter how the light screen is moved, the candle flame cannot be obtained on the light screen like.

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Update Time: 2024-07-06

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

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