I. Multiple choice questions:
(2006 Hebei) Xiaoming in the investigation of the law of convex lens imaging, keep the position of the convex lens unchanged, successively put the candle on the a, b, c, d, four points and adjusted the position of the light screen, respectively, as shown in Figure 2, after the investigation of the following statements he summarized. Which is correct (A)
A. The camera is the use of candles placed at point a imaging characteristics made
B. Magnifying glass is the use of candles placed at point b imaging characteristics made
C. Slide projector is the use of candles placed at point d imaging characteristics made
D. Candles placed at point b into the image of a larger than it is placed at point c into the image of a
D. Candles placed at point b into the image of a larger than it is placed at point c into the image of a larger than the image of a larger than it is placed at point c into the image of the image
(2006 Shanghai Pudong) >(2006 Shanghai Pudong) a student to do convex lens imaging experiment, when the light screen from the convex lens 12 centimeters, found that there is a clear reduced image on the light screen, from which you can judge the focal length of the convex lens may be ( B )
A. 5 centimeters B. 10 centimeters C. 15 centimeters D. 20 centimeters.
(2006 Jiangxi) there are three focal length are 20cm convex lens, Xiaoming use them to do some simple optical equipment, the first made a simple camera, shooting a picture on the wall; the second made a projector, the presentation of a slide; the third directly as a magnifying glass, observed a small insect. The use of the process, the following corresponds to the correct line is (C)
(2006 Beijing Chaoyang District) convex lens focal length is 12cm, the object will be placed on the spindle from the center of the lens at 7cm, the object is like (C)
A. inverted, shrunken image
B. inverted, magnified image of the real
C. orthogonal, enlarged image of the imaginary
D. Orthostatic, magnified virtual image
(2006 Linyi City)Li Ming's mother found that since Li Ming went to junior high school, he studied harder than before, but also found that the distance between Li Ming's eyes and the book when he was reading was getting closer than normal, so please choose the correct one among the following judgments and corrective measures and explain it to his classmates (B)
A. A. Li Ming is nearsighted and needs to wear glasses made of convex lenses
B. Li Ming is nearsighted and needs to wear glasses made of concave lenses
C. Li Ming is farsighted and needs to wear glasses made of convex lenses
D. Li Ming is farsighted and needs to wear glasses made of concave lenses
D. Li Ming is farsighted and needs to wear glasses made of concave lenses
D. Li Ming is farsighted and needs to wear glasses made of concave lenses
D. Li Ming is farsighted and needs to wear glasses made of concave lenses
D. Li Ming has been a long time ago. (2006 Xiamen) in the "study of the law of imaging convex lenses" experiment, the following statements are correct: (C)
A, the order of equipment on the light seat is the candle, light screen, convex lens
B, virtual image can also be made in the light screen
C, into a real image, when the object distance decreases, the image distance increases, the image becomes larger. image distance increases, the image becomes larger
D, before the experiment to adjust the height of the candle, light screen and convex lens, so that their centers are in a straight line
(2006 Foshan) (C )
(2006 Guangzhou Haizhu) the candle is placed on the main axis of light 40cm away from the convex lens, the other side of the lens screen to get a clear magnified image. If the candle in the original position to move away from the direction of the lens 40cm, then the clear image - must be (D)
A. false image B. enlarged C. upright D. narrowed
(2006 Hebei) Xiaoming in the investigation of the law of imaging of convex lenses, to keep the position of the convex lens remains unchanged, successively put the candle on the four points of a, b, c, d, and adjusted the position of the light screen, respectively. and adjust the position of the light screen, respectively, as shown in Figure 2, after the investigation he summarized the following statements. Which is correct (A)
A. The camera is the use of candles placed at point a imaging characteristics made
B. Magnifying glass is the use of candles placed at point b imaging characteristics made
C. Slide projector is the use of candles placed at point d imaging characteristics made
D. Candles placed at point b into the image of a larger than it is placed at point c into the image of a
D. Candles placed at point b into the image of a larger than it is placed at point c into the image of a larger
(2006 Yichang)
(2006 Yichang) object through a convex lens can be formed on the light screen inverted magnification of the real image, which of the following optical instruments apply this imaging principle (C)
A. camera B. magnifying glass C. slide projector D. car mirrors
(2006 Hengyang) the human eye is like a camera, the lens and the cornea of the **** with the role of the equivalent of a convex lens. When a person observes an object, the object on the retina is like (A)
A. inverted, shrunken solid image B. inverted, enlarged solid image
C. upright, enlarged virtual image D. upright, enlarged solid image
(2006 Zhuzhou) the remote control of the TV can emit an invisible light, called infrared, with which you can realize the control of the TV set. The remote control can emit an invisible light called infrared light. Sometimes the remote control is not aimed at the control window of the TV, but along a suitable direction to the wall to press the button, you can also control the TV, which is the use of ( A )
A. Reflection of light B. Refraction of light C. Straight-line propagation of light D. The speed of light is very large
(2006 Taiyuan) the human eye is like a camera, the object of the light emitted through the lens refraction imaging on the retina, the retina, the retina, the retina, the retina, the retina, the retina, the retina, the retina, the retina. (B)
A. Inverted, magnified solid image B. Inverted, reduced solid image
C. Orthogonal, magnified virtual image D. Orthogonal, reduced virtual image
(2006 Zhenjiang) Common vision defects are myopia and hyperopia. The figure on the right is a visual defect of the person's eye imaging schematic, the type of his visual defects and correction of vision need to wear the type of lens is (A)
A. Hyperopia, convex lens B. Hyperopia, concave lens
C. Hyperopia, convex lens D. Hyperopia, concave lens
(2006 Zhenjiang) a convex lens with a focal length of 10cm, will light the candle From 50cm from the convex lens to 15cm in the process, the size of the image and the image distance of the change in the situation is (B)
A. like a bigger, smaller distance B. like a bigger, bigger distance
C. like a smaller, smaller distance D. like a smaller, larger distance
(2006 Xuzhou) the following optical instruments, does not belong to the application of convex lenses (C)
A. magnifying glass, a convex lens, a concave lens
A. magnifying glass, a concave lens, a concave lens, a concave lens, a convex lens
(2006 Zhenjiang) p>
A. Magnifying glass B. Myopic glasses C. Camera D. Microscope
(2006 Yancheng) The following light path diagram, the correct one is ( A )
(2006 Jinzhou) The following statements are correct ( A )
A. The lens of the projector is equivalent to a convex lens
B. Myopic eyes should wear glasses made of convex lenses
C. When looking at a map with the help of a magnifying glass, the distance from the magnifying glass to the map should be greater than the focal length
D. The human eye is equivalent to a camera, and an object can form an orthogonal, reduced, real image on the retina
(2006 Shenyang) A In a sunny classroom, Xiaoyang holds a convex lens with a focal length of 10cm and moves it between the white wall and the window. The image of the window, the image is ( B )
A. inverted, equal size B inverted, reduced
C. upright, magnified D upright, reduced
(2006 Chengdu) on the imaging of the four optical instruments, the following statements are correct ( C )
A. magnifying glass into an upright, magnified solid image
B. photographic, machine into an upright, reduced solid image
C. slide projector into an inverted, enlarged solid image
D. myopic glasses into an upright, enlarged virtual image
(2006 Chengdu) the focal length of the lens of a camera for 10cm, Xiaogang used it to their own physics small works of art exhibition photo, when the camera is on the works from 50cm to 12cm in the process of movement ( A)
A. like a bigger, larger distance
B. like a bigger, smaller distance
C. like a smaller after the larger, larger distance
D. like a smaller after the larger, smaller distance
Two, fill in the blanks:
(2006 Neimeng) The figure below is "to investigate the imaging law of convex lens" experiment. Law" of the experiment, the focal length of the convex lens used 10cm, the position of the convex lens in the experiment is fixed. When the light screen at 1.5 times the focal length, there is an image on the screen. Do you think that in the straight line CD, the position of the light screen is moved at least cm, the phenomenon of moving the candle screen at any time there is no image.
Answer: 5
(2006 北京市)一束平行光线经过凸透镜折射后的传播方向如图16甲所示，由图可知，此透镜的焦距为 cm；当把烛焰放在此凸透镜左侧12cm处时，如图16乙所示，则从该凸透镜右侧通过透镜可以看到一个 , magnified virtual image（填上: "upright" or "inverted").
Answer: 15cm; upright
(2006 Wuhu) human eye structure of the lens is equivalent to a mirror, the light from the object through the lens in the retina into a (fill in the "orthogonal" or "inverted") reduced image. The light from an object passes through the lens to form a (select "upright" or "inverted") reduced image. The human eye to observe the object most clear and not easy to fatigue distance, called the distance of vision. According to the structure of presbyopia, the visual distance of presbyopia is (greater than, equal to, or less than) that of the normal human eye.
Answer: convex lens, inverted, greater than
(2006, Heilongjiang) Clear bottles should never be thrown away in the forest. This is due to the fact that rainwater entering the drink bottle is equivalent to a _________ mirror, which has a _________ effect on the sunlight and may lead to forest fires.
Answer: Convex lens Convergence
(2006 Qinzhou City) The lens of a camera is equivalent to a Lens (fill in "convex" or "concave"); when you look at a postage stamp with a magnifying glass (as shown in Fig. 8), you see an enlarged image (choose "real" or "virtual").
Answer: Convex; Imaginary
(2006 Guilin) At one time, Xiaoming dropped a drop of water on the top of the glass plate of his desk when he was doing his homework at home, and when he looked down through the drop of water, he found that the text on the animated picture pressed underneath the plate had become larger. This is due to the water drop is equivalent to a , the text on the picture after the refraction of the water drop to form a magnified image (fill in "real" or "virtual").
Answer: convex lens, false
(2006 Yichang) microscope tube at each end of a group of lenses, each group of lenses is equivalent to the role of a Lens, the human eye through the microscope to observe tiny objects, see the enlarged image (fill in the false or real).
Answer: convex; virtual.
(2006 Huanggang) sports, researchers often use stroboscopic photography to analyze and guide the movement of athletes. Strobe photography is a photographic light source in a rhythmic flash, the light from the source of light irradiation to the athlete occurs _______ shot,
and through the camera in front of the _______ mirror
formation of _____________________
image. Looking at the photograph in the figure, it can be seen that strobe
photography requires that the background be _________
(fill in "light" or "dark").
Answer: reflection; convex lens; inverted, reduced image; dark
(2006 Xiangfan) A fish fed in a round fishbowl looks bigger than it really is because the round fishbowl is the equivalent of a _ mirror.
Answer: convex lens
(2006 Changsha)The diagram shows a parallel beam of light passing through a lens, which can be seen from the diagram as a __________ lens. When it is used as the lens of a camera and the object is placed beyond 2 times the focal length, it makes an inverted, reduced _________ image.
Answer: convex ; real
(2006 Zhuzhou) The eyes are the windows of the soul. Figure 1 shows the light path when Xiao Liang looks at a distant object, he is ____________ eyes. The way to correct it is to wear glasses made of ____________ lens lenses.
Answer: myopia; concave
(2006 Changchun) the human eyeball seems to be a camera, the lens and cornea *** with the same role is equivalent to a _______________ lens, the light from the object will be formed in the retina of a _______________ image (fill in "upright" or "inverted"). " or "inverted"). If you do not pay attention to eye hygiene for a long time, it will lead to myopia. There is a kind of surgery to treat myopia that uses a laser to treat the cornea so that the lens formed by the lens and cornea becomes _______________ stronger or weaker in its ability to deflect light.
Answer: Convex (or convergent); Inverted; Weak
(2006 Jinzhou) Xiao Qiang uses a camera with a certain focal length to take a picture of a scene. If he moves the camera away from the scene being photographed, the clear image of the scene on the negative will be ____(choose "larger", "smaller" or "unchanged").
Answer: smaller
(2006 Yunnan) A convex lens converges light. The focal length of a camera lens is 15cm, to become a clear image of the person on the negative, the distance between the person and the lens should be 30cm (fill in "greater than", "less than" or "equal to"); The image on the negative is like (fill in "real" or "virtual").
Answer: greater than; real
(2006 Zhaohsing) The human eye is structurally very similar to a camera, and the lens is the equivalent of a convex lens, which enables objects to be imaged on the retina. In the following diagrams A and B, the myopic eye is corrected by the use of spectacle lenses (optional: "C" or "D").
Answer: a, d
Three, graphing questions:
(2006 Guangzhou) draw Figure 13 in the light AB through the convex lens after the trail.
(2006 Beijing Chaoyang District) As shown in Figure 9, according to the refraction of light, fill in the dotted box with a suitable lens.
(2006 Sichuan Leshan) Complete the light path of the lens in Figure 1.
(2006 Xiamen) In Figure 12, complete the light path of the light rays from the left to the convex lens after refraction and then to the concave lens after refraction.
(2006 Hebei) Make a diagram as required below. Figure A is a schematic diagram of a distant object imaged in someone's eye, fill in the dotted box in Figure B with a suitable lens so that the distant object is imaged on the retina.
(2006 Taizhou) Draw the approximate position of the object imaged by a myopic eye looking at the object in Fig. 10, and label the image point A′ corresponding to point A on the object.
(2006 Jinzhou) Draw the ray of refraction of the incident ray in Fig. 4.
Answer
(2006 Tai'an)Based on the incident or refracted rays of light in the following two figures, make the corresponding refracted or incident rays.
Four, experimental questions:
(2006 Lianyungang) in the imaging of convex lenses in the experiment, the focal length of the lens used for 10cm. a student as shown in the figure below to place the candle and lens, move the light screen left and right always do not get a complete image of the candle flame, the reason is . The student made appropriate adjustments (the object distance remains unchanged), move the light screen, until the light screen to get a clear, complete image of the candle flame. The nature of the image is .
Answer: candle flame, lens, the center of the light screen is not at the same height; inverted, magnified, solid image
(2006 Wuxi) Xiaoming stood in the same position with a digital camera (focal length can be changed) to the famous Wuxi attractions - Xishan successively took two photographs of A and B, as shown in the figure. He had this question: the size of the object through the convex lens on the light screen and the focal length of the lens how the size of the image? Xiaoming investigated this.
(1) Ming has found some convex lenses, but does not know their focal lengths, please provide him with a way to measure the focal lengths of the lenses. (You can draw a diagram to illustrate)
(2) After measuring the focal length of the convex lens, Xiaoming successively chose three convex lenses with focal lengths of 15cm, 10cm, and 5cm respectively, and carried out the experiments in turn while keeping the object distance always 35cm, and found that the image formed was getting smaller and smaller. Based on the results of the experiment, determine which of the camera lenses had the greater focal length when Ming took the picture.
(3) During the investigation, Ming always kept the object distance constant.
Answer: (1) Place the convex lens facing the sun, put a piece of paper on the other side of the lens, adjust the distance from the lens to the paper until the smallest and brightest spot appears on the paper, and measure the distance from the spot to the convex lens, i.e., the focal length of the convex lens (other methods give the same points if they are correct)
(2) The focal length of the camera lens is larger when the photo B is taken
(3) The size of the solid image made by a convex lens is related to the object distance and focal length, so the object distance should be kept constant when studying the relationship between the size of the solid image and the focal length
(2006, Fuzhou) Read the following carefully and answer the questions as required.
The human eye
The human eye is much like a camera. The difference between the eye and the camera is: the human eye is by adjusting the degree of curvature of the lens, changing the focal length of the lens to obtain a clear, reduced image of the real, as shown in Figure 17; ordinary camera is in the case of the object distance to determine the distance by changing the image distance to make the image become clear. The farthest point at which the eye can see by its adjustment is called the far point, and the far point of the normal eye is at the extreme distance. The nearest point that the eye can see clearly is called the near point, and the near point of the normal eye is about 10cm away from the eye.The eye is an important organ of the human body, and prolonged use of the eye, such as reading books, watching TV, computers, can cause eye fatigue, and the common symptom of eye fatigue is a headache and dryness of the eyes. Look at the object for a longer time is not easy to feel fatigue distance is called the visual distance, the normal eye visual distance of 25cm.
(1) Please complete the text of the nature of the image.
(2) The human eye obtains a clear image by changing the lens, and the ordinary camera obtains a clear image by changing the object distance.
(3) According to the above, you think the range of observation of a normal human eye is: (fill in the following options).
A. 0 to 10cm B. 10cm to 25cm C. 10cm a very far away D. 0 to 25cm
(4) How to prevent eye fatigue, please make a rationalization suggestion: .
Answer: (1) inverted; (2) focal length (or degree of curvature), image distance; (3) c; (4) so that the distance between the object and the eyes is 25 cm (or do not read for a long time, take a break in the middle of the appropriate rest, or do more eye exercises) (other suggestions can be reasonable)
(2006 Fuzhou) As shown in Figure 12, Zhou Qian and a few classmates in doing the "To investigate the laws of convex lens imaging" experiment, on the light screen to get a reduced inverted clear solid image. At this time, Zhou Qian students will be their myopic glasses lens placed between the candle and the convex lens (near the lens), the results of the original clear image on the light screen became blurred.
(1) In order to make the image on the light screen clear again, how should the light screen be moved without moving the position of the candle and the lens?
_________________________________________________________________
(2) The four small diagrams shown in Figure 13 correctly represent the myopic imaging situation and corrective practices of Zhou Qian's classmates ( )
A. ② ① B, ① ③ C, ② ④ D, ③ ④
Answer: (1) the light screen to move away from the direction of the convex lens; (2) B
(2006 Shaoguan) Xiaoming use of the light stand, convex lens (focal length of 10cm), candles, matches, the light screen, to do the "investigation of the law of imaging convex lenses," the experiment.
(1) There are three sliders A, B and C on the light stand for placing the convex lens, light screen or candle (as shown in the figure on the left below), in which B should be placed: ．
(2)The experiment found that the light screen imaging as shown in the right figure above, you think the cause of this phenomenon is: ．
(3) When observing and recording the imaging of the convex lens, you should measure and .
(4) Place the candle 16cm from the convex lens, move the light screen back and forth, Ming (fill in "can" or "can not") see a clear image on the light screen.
(5) Then Ming used an opaque cardboard to cover the upper half of the convex lens, and then moved the light screen back and forth, he
(fill in "can" or "can not") see a complete image on the light screen.
Answers: (1) convex lens (2) candle, convex lens, the center of the light screen is not at the same level
(3) object distance; image distance (4) can (5) can
(2006 Nantong) in the use of the light stand to study the laws of imaging of convex lenses in the experiments:
(1) Measurement of the focal length of a convex lens as shown in the figure. _____cm.
(2) Place the candle, the convex lens, and the light screen in order on the light stand. After lighting the candle, adjust the centers of the candle flame, the convex lens, and the light screen to be approximately on _______________.
(3) When the candle flame is 30cm from the convex lens, move the light screen, you can get a clear inverted, _____ real
image on the light screen. _______ is to use this imaging law work (fill in the optical instrument).
Answers: (1) 9.4 (9.2-9.5) (2) Same height (3) Zoom in; camera
(2006 Neimeng) You are given a lens and don't know whether it is convex or concave, so write briefly three ways to determine it.
Answer: (1)
(2)
(3)
Answer: (1) The lens is moved against the sunlight (a parallel light source), and there is a bright spot on the other side indicating that it is a convex lens
(2) Touching it with your hand, and the one that is thicker in the center and thinner on the sides indicates that it is a convex lens
(3) Lighting a candle, and seeing if it can be imaged on the other side of the screen. The one that can be imaged is a convex lens