1. (Taizhou) When the object moves from the focal length of the convex lens to the lens, the following statement about the imaging situation is correct ().
A. you can always find the formed image with a light curtain. B. When an object reaches twice the focal length, it becomes an image of equal size.
C. The formed image gradually approaches the lens D. As long as the object distance is greater than the focal length, the image and the object are always located on both sides of the lens.
2. (Tai 'an City) As shown in the figure, when you look at the mirror with your eyes, the light beam seems to diverge from M, so the focal length of the lens is ().
A.0. 1m B.0.2m C.0.3m D.0.5m
3. (Weihai) A classmate kept the position of the convex lens unchanged when doing the experiment of convex lens imaging. As shown in Figure 5, candles are located at four points, A, B, C and D, and the position of the light screen is adjusted respectively. Regarding the imaging situation at four points: A, B, C and D, he summarized the following statements, of which the correct one is ().
A. When the candle flame is at point A, the real image on the screen is the smallest.
B. When the candle flame is located at point C, the real image on the screen is the largest.
C when the candle flame is located at point b, it becomes an equal inverted image.
D, when the candle flame is located at point D, it becomes an enlarged virtual image.
4. (Weifang) In the experiment of exploring the imaging law of convex lens, when the positions of convex lens, light screen and candle flame are as shown in the figure, a clear image can be formed on the light screen. Then ()
A. The image is an upright and reduced real image.
B. The image is an inverted and reduced real image.
C. Move the candle to the left and adjust the position of the light screen to get a smaller image.
D. Move the candle a little to the right and adjust the position of the light screen to get a smaller image.
5. When the convex lens of Yantai is facing the sunlight, the smallest and brightest spot can be obtained at the distance of 15cm from the convex lens. If you put an object 20cra in front of this lens, you can get a ().
A. The real image enlarged by handstand B. The real image reduced by handstand
C. Vertical magnified real image D. Vertical magnified virtual image
6. (Zibo) belongs to the reflection of light in the following phenomenon is ().
A. the personnel in the submarine use periscope to observe the situation on the water.
B. sunlight is decomposed into various colors after passing through the prism.
C. Solar and lunar eclipses can be seen on the earth. D. Observe the subtleties of objects through a magnifying glass.
7. (Guang 'an City) Xiaojun's grandfather is blind, but he loves learning. Xiao Jun, who respects his elders, bought him a magnifying glass with the pocket money he saved. When Xiaojun's grandfather read the newspaper with a magnifying glass, the text he saw was ().
A. vertically enlarged virtual image B. vertically enlarged real image
C. Inverted reduced real image D. Inverted enlarged real image
8. (Chengdu) After learning about lenses, in order to turn a beam of wide parallel light from the left into narrow parallel light, Xiao Wang found three thin lenses, of which the focal length of convex lens L 1 is 5cm, convex lens L2 is 3cm and concave lens L3 is 2cm. Xiao Wang designed four optical paths as shown in figure 17, and the one that can achieve the goal is ().
9. (Guangyuan City) As shown in Figure 2, wearing myopia glasses on the convex lens can form a clear image on the light screen. If you take off your nearsighted glasses, in order to make the image on the light screen clear, keep the candle flame and the lens position unchanged, you should turn the light screen ().
A. close to the lens B. away from the lens C. both close to the lens and away from the lens D. keep in the original position.
10. (Mianyang City) Students have many sayings in the process of learning the phenomenon of light, and we choose four of them: ① Light year is a very large time unit; (2) "Looking at the sky from the well, you can see very little" implies the principle of straight-line propagation of light; (3) The "reflection" on the calm lake shows that the law that a plane mirror becomes an "image at right angles to an object" is not valid; Look at the words under the glass plate on the table and see the virtual image of the words. It is correct to judge whether these statements are right or wrong ()
AB.①②④1234Both are correct B.124Right, ③ Wrong.
C.23 Correct, 14 Wrong D.②④ Correct, 13 Wrong.
1 1. (Mianyang City) Place two identical convex lenses L 1 and L2 as shown in Figure 2, where AO 1 = O 1b = BO2. A ray passing through point A is refracted by L 1 and reaches L2 in the direction shown in the figure. Then, about the direction of light refracted by L2.
A. a point twice the focal length of L2 B. a point c with the focal length of L2. a point d with the main optical axis parallel to L2. a point not twice the focal length of L2.
12. (Panzhihua) The focal length of the convex lens is l2cm. When the object is placed 7cm away from the center of the lens on the main optical axis, the object passes through the lens and becomes a clear image on the screen ().
A. Vertical enlarged virtual image B. Inverted reduced real image
C. Inverted and enlarged real image D. Vertical and equal virtual image
13. (Beijing) The following optical equipment is used, the purpose of which is to invert the object to reduce the real image ().
A. magnifying glass b camera c slide projector d projector
14. (Tianjin) The focal length of the lens of the slide projector is F. When it is used for projection, it is necessary to make an enlarged and clear image on the screen, and the distance between the slide and the lens should be
A. greater than 2f B equals f c greater than f less than 2f D less than f.
Second, fill in the blanks:
15. (Tai 'an) When the photographer takes a group photo with a camera with a fixed focal length, and then takes a bust of Xiaoming, the photographer should (fill in "increase" or "decrease" the distance between the camera lens and Xiaoming, and at the same time (fill in "increase" or "decrease" the distance between the lens and the film).
16. (Taiyuan) Figure 5 shows the phenomenon that the sunlight burns the paper after passing through an optical element in the dotted box. It can be seen from this that optical devices using such elements include (just one example).
17. (Chengdu) When using the slide projector, if you want to enlarge the image on the screen, you should make the slide projector _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
18, (Guang 'an 2) In order to prevent forest fires, it is not allowed to throw transparent beverage bottles anywhere in the forest. This is because rainwater acts on light after entering the beverage bottle, which is equivalent to a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
19. (Neijiang City) As shown in the figure, the distances between F and F' and the convex lens are equal to the focal length, and the distances between P and P' and the convex lens are twice the focal length. Then, the candle flame on the screen should be an inverted _ _ _ _ (fill in "zoom in", "zoom out" or "equal in size") real image; If the candle moves between P and F, after adjusting the screen, the image obtained on the screen will be _ _ _ _ (fill in "smaller", "larger" or "unchanged").
20. (Chongqing) Grandpa's hyperopia needs to be corrected with _ _ _ _ _ lenses. When Grandpa put on reading glasses, Zhang Li found that Grandpa's "eyes" seemed to get bigger through the lenses. This is because grandpa's "eyes" seen by Zhang Li are upright and magnified through the lens.
2 1. (Beijing) Convex lens for Xiao Gang experiment, focal length 10cm. The schematic diagram of the experimental device is shown in figure 15. Keep the position of the convex lens unchanged during the experiment. Please fill in the blanks according to your knowledge.
(1) Change the position of the candle so that it is on the scale line of 20cm, and then move the light screen so that the candle flame becomes a clear reflection on the light screen. (Optional: Enlarge, Equal or Reduce)
(2) Change the position of the candle so that it is located at the scale line of 35cm, and then move the light screen to make the candle flame become a clear real image of _ _ _ _ _ _ _ on the light screen. (Optional: "Inverted" or "Upright")
(3) Change the position of the candle so that it is located at the scale line of 42 cm. Xiao Gang can see an upright candle flame image through the lens from the right. (Optional: Enlarge, Equal or Reduce)
22. In the (Shanghai) drawing 12, the focal length of the convex lens is 10 cm. Keep the position of the lens unchanged. When the candle is at the scale of 15cm, in order to find the image in the center of the light screen, adjust the light screen and move the direction of the light screen (choose "away from the lens" or "close to the lens").
Three, drawing or short answer:
23. (Tongliao City) As shown in Figure 7, S is the luminous point and S' is the image formed by S through a convex lens.
(1) Draw the focus of the convex lens in the picture; (2) Draw the refracted ray of incident ray SP.
24 (Qingdao) optical black boxes each have a convex lens with a focal length of 4cm, and the main optical axis CC/ of the convex lens is shown in Figure 8. A beam of light is aimed at the focus of the convex lens and shoots into the black box. After refraction, it is aimed at the focus direction of the concave lens, and after refraction by the concave lens, it is emitted from the black box. Please complete the complete optical path in the box (draw the main optical axis and focus of lens, light and concave lens).
25. (Deyang City) Figure 9 completes the light path diagram according to the effect of the lens on light.
Fourth, the calculation questions:
26. When Xiaohua did the experiment of "Exploring the imaging law of convex lens", according to the recorded experimental data, he drew the curve of the image distance changing with the object distance. As shown in l8, please read the chart carefully and then answer:
(1) The focal length of the convex lens used in the experiment is _ _ _ _ _ cm.
(2) It takes 2s to move the object from 40cm to 20cm away from the convex lens. Find the average speed of object image movement in this process.
Fourth, experiment and inquiry:
27. (Shaanxi Province) Figure 2 shows the experimental device of "Exploring the imaging law of convex lens".
(1) After the candle is lit, adjust the convex lens and the shutter so that their centers are about _ _ _ _ _ _ _ _ _.
(2) In order to find the exact position of the image, it is necessary to fine-tune the screen, that is, move the screen left and right within a certain range, so that the image on the screen is blurred to _ _ _ _ _ _ _ _ _ _ _ _ _ _ until the clearest position of the image is found.
(3) As shown in the figure, if the candles are just inverted, equal in size and clear on the light screen, the focal length of the convex lens is _ _ _ _ _ cm.
(4) Keep the candle at the same position, and move the convex lens from the focal length of the candle to the candle by 2cm. You can observe the upright candle flame and the virtual image of _ _ _ _ _ _ _ _ _ _ _