Chapter III Physical Unit Detection Volume of Grade Two in Junior High School

First, multiple-choice questions,

1.(20 10, Wuhu, Anhui, 13) When an object is placed 20cm in front of the convex lens, a clear real image of the object is obtained on the screen, then the focal length of the convex lens may be

A.20cm B.15cm C.10cm d.5cm 265438+Century Education Network.

2. (Wenzhou, Zhejiang, 20 10, question 9) The tools used to observe onion epidermal cells and snail crawling are respectively

A. magnifying glass, magnifying glass

C. Magnifier, microscope

3. (Guangzhou City, Guangdong Province, 20 10/0,5) In Figure 5, A and B are two photos of the same person, and in Figure B, he is holding glasses.

A. It belongs to convex lens and can be used to correct myopia.

B. It belongs to convex lens and can be used to correct hyperopia.

C. It belongs to concave lens and can be used to correct hyperopia.

D. It belongs to concave lens and can be used to correct myopia.

4. (Weifang, Shandong, 20 10, 12) As shown in the figure, in the experiment of "studying the imaging law of convex lens", a clear candle flame image appeared on the light screen. Given that the focal length of the convex lens is f, it can be judged that the range of the image distance v and the object distance u is

A.v & ltf

B.f & ltv & lt2f

C.u & gt2f

D.f & ltu & lt2f

5. (Question 9, Yangzhou, Jiangsu, 5.(20 10/0) Put a lighted candle as shown in Figure A below at twice the focal length of the convex lens, and adjust the position of the light screen on the other side of the lens to find a clear image. This one looks like B in the picture below.

6.(20 10 Taizhou, Jiangsu, 12) As shown in Figure 6, the convex lens is regarded as the lens of the eye, the light screen is regarded as the retina of the eye, and the candle flame is regarded as the object observed by the eye. Put a pair of myopia glasses on "eyes", and a clear candlelight image will appear on the screen, while taking away the myopia glasses will blur the candlelight image. Then, after taking off the nearsighted glasses, the following operations can be clearly imaged on the screen again.

A. Keep the light screen away from the convex lens properly

B. Keep the candle away from the convex lens properly.

C, move the light screen close to the convex lens appropriately, or move the candle close to the convex lens appropriately.

D at the same time, keep the light screen and candle away from the convex lens properly.

7.(20 10 Zhaoqing, Guangdong, 9 questions) As shown on the right, the image of the candle through the lens is: (▲)

A. Inverted reduced real image B. Upright enlarged virtual image C. Inverted enlarged real image D. Upright reduced virtual image

8. (Guangdong Zhanjiang 20 10, question 13) Which of the following statements is correct?

A. The appearance of the China Pavilion of the Shanghai World Expo is red, because the China Pavilion has absorbed red.

B.ultraviolet rays and infrared rays travel at the same speed in the air.

C Presbyopia grandma should wear a convex lens to correct her vision.

The images formed by D camera, pinhole imaging and plane mirror are all real images.

8.(20 10 Henan Province, 13) As shown in Figure 6, A, B, C and D are four points with different distances from the convex lens, and F is the focus. The imaging principles of the following optical instruments correspond to the imaging of objects at different points. The following statement is correct.

A. The slide projector is made according to the imaging characteristics when the object is placed at point C..

B. the camera is made according to the imaging characteristics of the object when it is placed at point D.

C. the imaging situation when using a magnifying glass is similar to that when the object is placed at point a.

D. the imaging situation when people look at an object is similar to that when the object is placed at point F.

9.(20 10? Hebei Province, 17) The following statement about convex lenses is incorrect.

A. a convex lens can condense light.

B.a convex lens can correct myopia.

C. the virtual image formed by convex lens must be enlarged.

The real image formed by convex lens can be enlarged or reduced.

10.(20 10? Question 9 in Chengdu, Sichuan Province) The following statements about light are correct.

A. When light is diffusely reflected, it does not obey the law of light reflection. B when light is emitted from air into water, its propagation speed remains constant.

C. solar eclipse is formed by the reflection of light. A convex lens will condense light.

1 1.(20 10? Chengdu, Sichuan) as shown in figure 16, a is the image of Xiao Ming's eyes observed by Xiaoyan through the lens; B is the image of the word "physics" in the textbook observed by Xiao Liang with glasses. Regarding the images observed or the optical instruments used in the above two cases, the following statement is correct.

A. The image in Figure B may be a real image, and the glasses are reading glasses.

B. The image in Figure A may be a real image, and the position of the image may be between Xiao Ming's eyes and the lens.

C. The image in Figure B must be a virtual image, and the glasses are myopia glasses.

D. the image in figure a must be a virtual image, and the position of the image may be between Xiaoyan's eyes and the lens.

12.(20 10 Luzhou, Sichuan) When the film was shown, the pattern on the film was formed by a convex lens () on the screen.

A, inverted and enlarged virtual image B, upright and enlarged real image

C. Enlarge the virtual image D upright and enlarge the real image upside down.

13.(20 10 No.2 Middle School in Bengbu City, Anhui Province, Question 7) The flame of the candle only gets a reduced reflection on the screen through the convex lens. if

Keep the lens position unchanged, switch the position of candle flame and light curtain, and then

A. the reduced image can still be displayed on the screen.

B.an enlarged image will appear on the screen.

C. No image can be presented on the screen, but the eyes can see the image through the lens.

D. There is no image on the screen, so it is necessary to adjust the position of the screen to present 2 1 Century Education Network.

14.(20 10 Zhejiang Xiaoshan middle school 5 questions) Sophia Kao used portraits in the experiment of "exploring the imaging law of convex lens"

Instead of using candles, she drew a portrait in black strokes on a transparent glass plate. The actual size is shown in Figure (a). Put this cup

Put the glass plate on the optical bench, and illuminate the portrait on the glass plate with a parallel light source, as shown in Figure (b). Linear moving light curtain

Until it becomes clear on the screen. At this time, which picture is the portrait formed on the screen (C)? (1)

15.(20 10 Tianjin, 12) A classmate got a clear image of candle flame on the screen while exploring the imaging law of convex lens (pictured). In order to enlarge the clear image on the screen, the following adjustment method is feasible ().

A keep the candle away from the lens and the light screen close to the lens. B keep the candle close to the lens and the light screen away from the lens.

C, placing the lens close to the candle; D, place the lens close to the light screen.

16.(20 10 2 questions in Chuxiong prefecture, Yunnan province) 2. What is true about the phenomenon of light

A pinhole imaging is formed by light propagating along a straight line. B. plane mirror imaging is a refraction phenomenon of light.

C. the camera becomes a virtual image D. the convex lens can only become a real image.

17.(20 10 Dezhou, Shandong, 6 questions) When Xiao Qiang looks at a certain point in the distance, its optical path is as shown in Figure 4, then the following statement is correct.

Xiao Qiang's eyes are short-sighted. He should wear glasses made of convex lenses.

Xiao Qiang's eyes are short-sighted. He should wear concave lenses.

Xiao Qiang's eyes are farsighted. He should wear glasses made of convex lenses.

Xiao Qiang's eyes are normal. He doesn't need to wear glasses.

18. (Question 20 10/0,7 in Huadu District, Guangzhou) Put a luminous rod with a height of 2cm in front of a convex lens with a focal length of 5cm, and the screen behind the convex lens will become an image with a height of 4cm. The distance between the object and the convex lens can be

A.7.5cm B.12.5cm C. 4.5cm D.10cm

19.(20 10, Hechi, Guangxi, 16) In the experiment of "Exploring the imaging law of convex lens", when the candle, convex lens and light screen are in the position shown in Figure 5, a clear candle flame image appears on the light screen, which is ().

A. Inverted and enlarged real image B. Inverted and reduced real image 2 1 Century Education Network

C. Inverted, equal-sized real image D. Upright, enlarged virtual image

20. (Urumqi, Xinjiang, 20 10/0,6) The object S (not shown) is imaged on the light screen at M through the convex lens L. If the light screen is moved to N, the image of the object S will still be obtained on the screen, then the lens placed on the left side of the convex lens L is (A).

2 1 Century Education Network

2 1.(20 10 Zigong, Sichuan, 19) The following are some characteristics of real and virtual images, which are summarized after learning the knowledge of "flat mirror imaging" and "convex lens imaging", and the wrong one is ().

A. the virtual image cannot be accepted by the light curtain.

The size of the virtual image formed by B plane mirror and convex lens is related to the distance from the object to the mirror.

C. the real image must be accepted by the light screen.

D. the real image can be enlarged or reduced.

22.(20 10 Zigong, Sichuan, 20 questions) The world of light is rich and colorful, and optical devices are widely used in our life and study. The following statement is unrealistic ()

A. Short-sighted glasses use concave lenses to disperse light.

B. When taking pictures, the subject should stand two focal lengths away from the lens.

When looking at a map with a magnifying glass, the distance between the map and the magnifying glass should be more than one focal length.

D sunlight can ignite paper scraps through the convex lens, which makes use of the convergence effect of the convex lens on light.

23.(20 10 Guang 'an, Sichuan, 12) "Five? In the fourth Youth Day, the school invited a photographer to shoot graduation photo for us.

After queuing, the photographer found that several students did not enter the box. The correct way for him to readjust the camera is

A. the lens moves forward and the lens stretches forward. B. the camera moves forward and the lens retracts.

C. the camera moves backwards and the lens stretches forward. D. the camera moves backwards and the lens retracts.

24.(20 10 Chifeng, Inner Mongolia, 4 questions) Xiaohua used a convex lens with a focal length of 10cm in the classroom to get a clear image of a tree outside the window on a piece of white paper. This image is like ().

A. Reduce the inverted real image B. Reduce the inverted virtual image 2 1 Century Education Network

C. Enlarged and inverted real image D. Enlarged and upright virtual image

25.(20 10, Xiaogan, Hubei, 2 1) The word "stone" in the right picture is an image observed through a convex lens. The following optical instruments apply this imaging principle.

A. camera projector magnifying glass microscope

26.(20 10 Quanzhou, Fujian province, question 15) In order to read newspapers conveniently, people with hyperopia should choose the glasses lenses.

A. plane mirror B. concave lens C. convex lens D. convex mirror

27.(20 10, Binzhou, Shandong, 1) As shown in the picture, it is a photo of "Tiandi Bridge" in Binzhou Zhonghai National Water Conservancy Scenic Area taken by Xiao Ming. The following statement is correct.

A. If you want to make the image of the bridge smaller, Xiao Ming should shoot away from the bridge.

B. The reflection of the bridge in the water is formed by the straight-line propagation of light.

C. The reflection of the bridge in the water is formed by the refraction of light.

D. When shooting, the image on the negative is an enlarged and inverted real image.

28. (Guangdong Maoming 20 10/0,8) The following statement about the role of optical instruments is correct ()

A. A plane mirror can form a virtual image of the same size. B. A magnifying glass is a convex lens, which can only form an enlarged image.

C. myopia glasses are concave lenses, which can disperse light. 21d. When the camera takes a picture, the negative becomes an inverted reduced real image.

Second, fill in the blanks,

1. (Chongqing, 20 10/0,8 questions) On July 22nd, 2009, Chongqing citizens experienced the spectacle of a total solar eclipse once in 500 years. As shown in Figure 4, every observer is attracted and shocked by the speed of this natural wonder. In fact, the solar eclipse is formed by the spread of light. The lens in our eyeball is equivalent to a mirror, which can gather light.

Straight line, convex lens

2.(20 10, Yiwu, Zhejiang, 24 questions) As an information exchange platform, the Internet has brought a lot of convenience to our lives, but a few teenagers are addicted to the Internet and overuse their eyes, so that the light from distant objects focuses on the retina, forming inverted images and reducing images, which leads to myopia. Time shift

3.(20 10, Nanjing, Jiangsu, 20 questions) As shown in the figure, Xiao Ming did the experiment of "exploring the imaging law of convex lens" with candles, convex lens and light screen.

The focal length of (1) convex lens is 10cm. When the candle flame is in the position shown in the figure, moving the screen can obtain an inverted position on the screen.

▲ Real images. In cameras and projectors, the imaging situation is similar.

(2) In the experiment, the burning time of the candle is getting shorter and shorter, and the image of the candle flame on the screen moves ▲ (optional "Up", "Down" and "No").

(1) Zoom up the projector (2)

4.(20 10 Suqian, Jiangsu, 25 questions) Xiaoming did the experiment of "exploring the imaging law of convex lens" with candles, convex lens and light screen (pictured).

(1) In order to make the image of candle flame in the center of the screen, the candle should be turned to ▲

(Fill in "Up" or "Down") Adjustment.

⑵ Place the candle flame at a distance of 20cm from the convex lens, move the screen to a certain position, and get a clear image with the same size on the screen, then the focal length of the convex lens is ▲ cm.

(3) Move the candle flame 2 cm to the right. At this time, you should move the screen to another position (fill in "left" or "right") to get a clear inverted image and ▲ (fill in "zoom in", "zoom out" or "equal size").

(1) at the right magnification of (2) 10 (3)

25.(20 10 Yangzhou, Jiangsu) Normal eyes can image objects with different distances on the retina. Myopia will make the image of distant objects on the retina _ _ _ _ _ _ _ _ (front/back), which can be corrected by adding a _ _ _ _ lens in front of the eyes. Qian' ao

6. (Shandong Heze 20 10/0,6) In the four pictures shown in Figure 4, the answers that can correctly represent the myopia imaging situation are C and A, which can correctly represent the myopia correction methods.

7.(20 10 Suzhou, Jiangsu, 22 questions) When exploring the imaging law of convex lens, adjust the flame of convex lens, light screen and candle to make it

The center is on the same line, roughly at the same height. When the object distance is 20cm, you can move the screen and get it on the screen.

To a clear isometric, inverted real image. When the object distance is 25cm, you can get a clear picture by moving the screen.

The true image of falling head. When the object distance is 5cm, it becomes an image. In magnifying glasses and projectors, the imaging situation is similar.

▲. Reduce the vertical magnifying virtual magnifying glass

8(20 10 Changzhou, Jiangsu, 27 questions) Yancheng Folk Street, Xiaoming half carved a pair.

The micro-sculpture work ""(upper circle and lower flat) on the rice has aroused strong interest.

(1) In order to see the figures and images on the micro-sculpture, Xiao Ming should use the A (optional serial number) in the shot as shown in the figure.

(2) After choosing the correct lens, Xiao Ming holds the lens facing the sun, and then sticks a piece of paper on the other side. When a smallest and brightest light spot appears on the paper, the distance from the light spot to the lens is measured as 5 cm.

(3) Observing the micro-sculpture works through the lens, Xiao Ming sees the image as shown in the figure. At this time, the distance from the lens to the work is a.

A. less than 5cm B. more than 5cm and less than10cm C. equal to10cm D. greater than10cm.

9 (Question 26, Huanggang, Hubei Province, 9(20 10/0) When inspecting the circuit board with dense lines, the maintenance personnel often observe it through a larger lens, which should be _ _ _ _ _ _ _ (fill in "convex" or "concave"), and the workers see an enlarged _ _ _ _ _ _ _ _. Lighting is also used for maintenance, that is, to illuminate _ _ _ _ _ (fill in "lens" or "circuit board").

Circuit board with convex virtual less than 1 multiple focal length

10 (Wuhan, Hubei, 20 10) Xiaoming explored the imaging law of convex lens with equipment such as convex lens, candle, light screen and ruler.

(1) As shown in the figure, in order to measure the focal length of the convex lens, Xiao Ming faces the convex lens.

In the sun, put the light screen on the other side of it and change the distance between the convex lens and the light screen.

From until a new light spot appears on the screen, you can measure.

The focal length of the convex lens is cm.

Please draw the main optical axis of the convex lens in the picture.

(3) Xiaoming moves the candle flame, convex lens and light screen to the same height at high speed, no matter how he moves the light screen on the horizontal desktop.

Can't accept the image of candlelight, the reason may be.

(4) After a period of experiments, the candles became shorter. In order to keep the image of candle flame in the center of the light screen, the light screen should be moved.

(1) Minimum value (brightest and clearest)

(2) The main optical axis of the convex lens is as shown in the figure:

(3) The candle is in a focal length (or focus) of the convex lens.

(4) business

1 1(20 10 Xiangfan, Hubei Province, 36 questions) As shown in Figure 8, in the experiment of "Exploring the imaging law of convex lens", a beam of light parallel to the main optical axis of convex lens passes through the convex lens and forms a smallest and brightest spot on the screen. When the candle flame is placed 25cm away from the convex lens, moving the light screen back and forth on the other side of the convex lens will get a real image on the light screen (fill in the image properties); If you keep the candle away from the lens at this time, you need to get a clear image on the light screen, and the light screen should move in the direction of the lens (optional "near" or "away").

Reverse reduction method

12.(20 10 Beijing, 17)

weaken

13.(20 10 Jixi, Heilongjiang, 17) In the process of exploring the imaging law of convex lens, when the light screen moves to the position in the figure, a clear image appears on the light screen. The essence of this image is. If you want to make the image smaller, should the candle turn? Move sideways.

Inverted and reduced real image; Zuo2 1 Century Education Network

14.(20 10 Chongqing Qijiang, 10) Convex lens has _ _ _ _ _ effect on light; When a convex lens with a focal length of 3cm is used as a magnifying glass, the distance from the object to the lens should be _ _ _ _ _ _ _ _ _ _ (choose "greater than", "less than" or "equal to") 3cm. Convergence less than

15.(20 10, Meizhou, Guangdong, 15) As shown in Figure 4A, it is a surveillance camera installed at many intersections in modern cities, which can take photos of the scene when driving illegally or traffic accidents occur. The lens of a camera is equivalent to a lens, and its working principle is similar to (camera, projector or magnifying glass can be selected). As shown in Figure 4, B and C are two photos taken after a car collided with a bicycle when passing through the intersection. As can be seen from the picture, the car is gradually (choose "approaching" or "leaving") the camera.

Answer: convex, camera, far

16. (Jilin Province, 20 10, 10) Looking at the words on the nearby books with the lenses of reading glasses, what you see is like this; If you use it to look at distant trees, move the lens appropriately until you see a clear image, and you will see a good image.

Answer: Virtual, real.

17.(20 10 Huai 'an, Jiangsu Province, question 13) Imaging schematic diagram of myopia, as shown in the figure. Compared with eyes with normal vision,

Short-sighted lens, light convergence (optional "convergence" or "divergence")

Strong ability; The lenses of myopia correction glasses should be concave lenses.

The function is to disperse light and make it appear on the retina. 20068. 100000000506

18.(20 10 Ningxia, 28 questions) As shown in the picture, it is the first set of special stamps for the 20 10 Shanghai World Expo. Observe the smaller pattern on this stamp with a convex lens with a focal length of 15cm, and the distance from the stamp to the lens should be ().

A,/kloc-more than 0/5cm b, more than 30cm.

C, less than 15cm d, less than 30cm.

Explain the reason:

C. Reason for selection: "When the object distance is less than 15cm, the convex lens can be used as a magnifying glass, so C is selected.

19.(20 10 Neijiang, Sichuan,1) In July 2009, a total solar eclipse was observed in our city, and visible light propagated along _ _ _ _ _ _ _ in the same homogeneous medium. When observing the total solar eclipse, you can't face the sun directly with your naked eyes. This is because the lens in people's eyes is equivalent to a _ _ _ _ _ _ _, which will concentrate sunlight and burn the retina.

Linear convex lens

20.(20 10 Chifeng, Inner Mongolia, Question 15) Birds flying in the sky can be reflected on a calm lake. People standing by the lake can see fish and birds playing together. Seeing that the "fish" in the water is a _ _ _ _ _ _ _ phenomenon of light, and seeing that the "bird" in the water is a _ _ _ _ _ _ _ _ phenomenon of light; Find a cylindrical glass bottle filled with water, put a pencil horizontally on one side of the glass bottle, and you can see the shape of the pencil through the glass bottle (fill in "unchanged" or "changed"); When you slowly move the pen from the position near the glass bottle to the distance, through the glass bottle, you will see that the pencil tip will gradually _ _ _ _ _ _ _ (fill in "long" or "short"), and when it reaches a certain position, the direction of the pencil tip will be _ _ _ _ _ _ _ _.

Refractive reflection becomes longer and longer.

2 1.(20 10, Taian, Shandong, 16) The lens in the human eye structure is equivalent to a _ _ _ _ _ _ _ _ lens, and the light from the object can form _ _ _ _ _ _ _ _ on the retina through the lens (select "inversion" or "inversion". Answer: convex; Fall head; True;

22. (Shanghai, 20 10, Question 12) Glasses are widely used in life. The projector lens and magnifying glass both use (10) lenses (convex or concave), but the projector is (165438+). Answer: convex; True; empty

23. (Changsha, Hunan, 20 10, 32 questions) Xiaogang used candles, convex lenses and light screens to explore the imaging law of convex lenses. The experimental device is shown in the figure. In order to position the image in the center of the screen, the screen in the picture should be adjusted to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Answer: Zoom down.

Fourth, drawing questions,

The imaging law of 1. (Anhui, 20 10, 10) convex lens can be understood by drawing the optical path diagram. In the optical path diagram, the convex lens is represented by Figure A, with point O as the optical center and point F as the focus. Fig. b is an optical path diagram that makes the image A'B' of the painted object AB pass through the convex lens by using two special rays. Please refer to Figure B, and draw the optical path diagram of the image C'D' formed by the object CD in Figure C through the convex lens. ..

2. (Guangzhou, Guangdong, 20 10, 17(3)) Draw the incident light according to the light refracted by the lens in Figure 20.