"Lens in Life" Lenses and their applications PPT download

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"Lens in Life" Lenses and their applications PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Camera

1. In order to regulate traffic behavior, the traffic control department has installed surveillance cameras at many intersections. They can take photos of illegal driving or traffic accidents. When taking pictures, the lens of the camera is equivalent to a convex lens (optional "convex lens" or "concave lens"). ” ), into a reduced (select “enlarge”, “reduce” or “equal size”) image.

2. Xiaoli and Xiaogang use the same camera to take pictures of the same scene in the distance, and the developed negatives are as shown in Figure A and Figure B respectively, then (C)

A. Xiaoli is far away from the scene being photographed

B. Xiaogang and Xiaoli are equally far away from the scene being photographed

C. Xiaogang wants to make the image on the film as big as Xiaoli's. After Xiaogang moves the position, the lens needs to be extended forward.

D. Xiaogang wants to make the image on the film as big as Xiaoli's. After Xiaogang moves the position, the lens needs to shrink back.

Knowledge point 2 Projector

3. As shown in the picture is a commonly used equipment in teaching - a projector. The following description about the projector is incorrect (D)

A. The image of the object on the screen is a magnified image

B. The surface of the screen is rough, which is conducive to diffuse reflection of light.

C. The function of a plane mirror is to change the propagation direction of light

D. If the image on the screen becomes smaller, the lens should be closer to the projection film and the projector should be further away from the screen.

4. (Dongying High School Entrance Examination) Dongying City launched the "Red Movies into the Community" activity, which was well received by residents. The lens of the movie projector is equivalent to a convex lens (optional "convex lens" or "concave lens"). When the movie is projected, an "inverted" and enlarged real image is formed on the screen.

Knowledge point 3: Magnifying glass

5. Xiao Ming observes through the mineral water bottle filled with water that the characters in the physics book have become larger and clearer. This is because the mineral water bottle is equivalent to a magnifying glass at this time, and the characters observed at this time are upright and enlarged images.

6. As shown in the picture, soak ginseng in wine. What you see through the wine bottle is an enlarged image of ginseng. At this time, the wine and wine bottle are equivalent to one (A)

A.Magnifying glass B.Camera

C. Convex mirror D. Concave lens

Knowledge point 4 Real image and virtual image

7. After learning the knowledge of optics, Xiao Ming organized the virtual and real images captured by the various optical instruments he learned: ① small hole imaging, ② plane mirror imaging, ③ camera imaging, ④ projector imaging, ⑤ magnifying glass imaging, among which the real image is Those that are ①③④; those that are virtual images are ②⑤; those that are inverted are ①③④ (please fill in the serial numbers).

8. Which of the following statements about real images and virtual images is correct (D)

A. The virtual image is a shadow, and the real image is a spot formed by actual light.

B. The virtual image is a human illusion, while the real image has actual light entering the human eye.

C. The real image is formed after light is refracted, and the virtual image is formed after light is reflected.

D. Real images can be presented on the light screen, but virtual images cannot

Lens PPT in Life, Part 2: Improvement of Comprehensive Ability

9. The scale part of a commonly used thermometer is a triangular prism. The cross section is as shown in the figure. The front side is arc-shaped, so that the extremely thin mercury column inside the thermometer can be seen clearly for easy reading. This is because of the function of the arc-shaped glass. It is equivalent to a convex lens, allowing us to see the enlarged virtual (optional "real" or "virtual") image of the mercury column.

10. QR codes can be seen everywhere in modern life. As shown in the picture, the QR code is scanned with a mobile phone. The QR code pattern is a real image through the lens of the mobile phone (optional "real image" or "virtual image").

11. Many cars have "reversing anti-collision visual radar". The camera installed at the rear of the car is aimed at the obstacle behind the car. The obstacle is turned upside down through the convex lens in the camera (optional "upright" or "inverted" ), this image is processed, adjusted and transmitted to the display screen through electronic devices, so that the driver can accurately understand the situation behind the car.

12. As shown in the picture, when the photographer in the early photo studios saw the scene, it looked like it was upside down. Which of the following statements is correct (C)

A. The lens of this camera is a concave lens

B. Raise the camera so that you can see the full-length images of the two photographers

C. If you want a full-body image, you should increase the distance between the camera and the two photographers

D. If you want the portrait to be brighter, you need to provide "fill light" behind the two people taking the photo.

13. Which of the following statements about images is correct (D)

A. Both real and virtual images can be inverted

B. The image observed with the eyes must be a virtual image

C. The formation of virtual images follows the laws of reflection, and the formation of real images follows the laws of refraction.

D. Both plane mirrors and convex lenses can create virtual images

14. Some products have an expiration date. The winery stamps the production date of the bottled wine on the back of the trademark and affixes it to the bottle. Although the characters are small, we can still clearly see the date through the liquor in the bottle. This is because (B)

A. Human eyes have special functions

The word B. is enlarged by the wine in the bottle

C. The enlarged image of the character is closer to the human eye

The word D. is enlarged by the glass of the bottle

Lens PPT in life, the third part: Expansion, exploration and breakthrough

17. Read the passage and answer the questions.

When taking pictures, choose different "apertures" to control the light entrance area of ​​the lens; choose different shutter speeds to control the light entrance time of the lens. The purpose of combining the two is to keep the light energy received by the film constant. If the light energy is too large or too small, you will not be able to get good photos. The table below shows several correct combinations of aperture and shutter speed under certain circumstances. In the "Shutter" row, "15" means that the shutter is open for 1/15 s, and so on; in the "Aperture" row, "16" means that the diameter of the light-transmitting part of the lens is equal to 1/16 of the focal length of the lens. So on and so forth.

(1) It can be seen from the above table: the larger the aperture value, the smaller the light entrance area, the larger the shutter value, the shorter the light entrance time;

(2) It can be seen from the above table that the light entrance time of the latter combination is basically 1/2 of the previous combination, and the light entrance area is about 2 times;

(3) Calculate the number that should be filled in the last box of the aperture row.

Keywords: Free download of PPT courseware for eighth-grade physics volume 1 of the People's Education Press, PPT download of lenses in life, PPT download of lenses and their applications, .PPT format;

For more information about the PPT courseware "Lens and its Applications in Life" PPT courseware, please click on the "Lens and Its Applications in Life" PPT courseware.

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Update Time: 2024-08-30

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

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