Provide 10 optical physics questions.

The second chapter of physics in grade two, the phenomenon of light, Volume A

1, regarding the propagation of light, the following statement is true [].

A, light always travels in a straight line;

B, light only travels in a straight line in vacuum;

C, the route of light propagation in the same uniform medium is straight;

Light travels at the same speed in different media.

2. "Shadow" is a common light phenomenon in our daily life, such as "hand shadow" formed by playing optical games and movies shown in cinemas; The reflection of the lake shore scenery in the water, the photos that left good memories during the spring outing-photography, etc. The "shadow" and physical knowledge listed below are incorrect []

A, hand shadow-straight line propagation of light;

B, reflecting-plane mirror imaging;

C, film-convex lens imaging;

D. photography-light reflection.

3. Of the four phenomena shown in the figure, () is formed by the reflection of light.

(1) hand shadow (2) pinhole imaging (3) reflection of the bridge in the water (4) "dislocation" of straight flower stems

4, the size of the object in the plane mirror depends on ()

(a) Distance from the object to the mirror (b) Size of the object (c) Size of the flat mirror (d) Position of the observer.

5, the following phenomenon belongs to the refraction of light phenomenon is ()

(a) From morning till noon, the shadow of the flagpole gradually becomes shorter in the sun; (b) The water people see by the swimming pool is shallower than it is.

(c) There are many bright spots on the ground under the dense shade in summer. (d) People saw the "reflection" of the small bridge in the water by the lake.

6. When measuring vision, using the imaging characteristics of flat mirror can save space. As shown in the figure, let the examinee face the mirror and the eye chart, and the distance from him when he sees the eye chart image is ().

(a) 3m (b) 4m (c) 5m (d) 6m

Standing by the calm pool, I saw a cloud in the water. This cloud is ()

(a) Virtual image formed by light reflection (b) Real image formed by light reflection.

(c) Virtual image formed by light refraction (d) Real image formed by light refraction.

8. At 6: 49 on October 24th, 2003 165438, a total solar eclipse occurred in Antarctica, lasting only two minutes. Because the Antarctic region is in the extreme day of summer, when the total solar eclipse occurs, the sun is completely covered (as shown in Figure 6), and the Antarctic region is dark, and penguins make restless calls. In which area of Figure 7 must a scientist be located to take the picture shown in Figure 6? ( )

A. Region1b. Region 2 C. Region 3 D. Region 4

9. Both parties are looking at the same mirror. Party A sees Party B's eyes in the mirror. The correct one in the following statement is [].

A.b can also see a's eyes. B. B can only see a's eyes.

C.B can't see A's eyes. D. B can't see A's whole body.

10, there is a kind of bicycle taillight with clever design. When the light from the car behind hits the taillights from any direction, it can "reflect back" the light. Figure 2-2 is a schematic cross-sectional view of four kinds of taillights, in which mirrors for reflecting light have different shapes. The mirror that can produce the above effect is [].

A.B. C. D。

1 1. In the 100-meter race of the school sports meeting, the timekeeper is always [] in order to keep time accurately.

A. Listen to the gunshots and press the stopwatch, because the sensitivity of the ears is higher than that of the eyes.

B. Look at the white smoke when starting, and press the stopwatch, because the sensitivity of eyes is higher than that of ears.

C it is ok to listen to the gunshots and see the white smoke, because the gunshots and white smoke happen at the same time.

D. Look at the white smoke when starting, and press the stopwatch, because the speed of light is much faster than the speed of sound.

12. During the partial solar eclipse, we can see the bright spot formed by sunlight on the ground through the gap of leaves under the big tree, and its shape is [].

A. circle B. crescent C. same shape as blade gap D. irregular shape

13. A person approaches a street lamp from a distance and then walks away from it. In this process, the length of the shadow changes with [].

A. First long, then short, then short to long B. First short, then long, then long to short.

C. It's getting longer and longer. D. it's getting shorter

14, the statement about the law of reflection is wrong []

A. The reflected light is always in the plane determined by the incident light and the normal.

B. the law of light reflection applies to all reflection phenomena.

C. When light is reflected on a spherical surface, it does not obey the law of light reflection.

D In reflection, when the incident angle increases α, the reflection angle also increases α.

15 is shown in the figure, which is four schematic diagrams of the letter "f" imaged by a plane mirror, and the correct one is [].

16. To see your full-body image in a flat mirror, the requirements for the length of the flat mirror are: []

A.it must be at least twice as tall. B.at least the same height.

C.it must be at least half as high. D. it can be less than half the height.

17, as shown in the figure, the correct one is []

18. A beam of light hits the interface of two substances obliquely at an angle of 30 with the interface, and the reflected light is just perpendicular to the refracted light, as shown in the figure. At this time, the incident angle and refraction angle are [] respectively.

30、30、30、60、60、30、60、60

19, there are trees and fish in the lake. People standing by the lake can see images of trees and fish in the lake, among which? [ ]

A. The image of the fish is real, and the image of the tree is virtual. B. The image of fish is virtual, but the image of tree is real?

C images of fish and trees are real images. The images of fish and trees are virtual images.

20. As shown in the picture, we see chopsticks inserted into the water obliquely, and the correct one is ().

A B C D

2 1, in figure (a) and figure (b), Xiaohong is standing on the shore and in the water respectively. Comparing these two figures, the observed phenomenon is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

22, a beam of light from the air vertical interface into the glass, the direction of light is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. (Fill in "bigger", "smaller" or "unchanged")

23. Light travels along _ _ _ _ in a homogeneous medium. The speed of light in a vacuum is _ _ _ _ _ _ _ m/s. 。

24. As shown in the figure, light is injected from one medium into another medium, and MN is the interface between the two media. One medium is air, so the incident angle is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

25. Xiaoming sees the image of the wall clock from the flat mirror as shown in the figure, and the time at this time is _ _ _ _ _ _ _ _.

26. Large flat mirrors are often installed on the walls of family or hotel halls, which can give people the feeling of _ _ _ _ _ _ _, which makes use of the principle of _ _ _ _ _.

27. The shadowless lamp used in the surgical operating room can avoid the shadow produced by hands and medical instruments during the operation. This kind of shadowless lamp is composed of many large-area luminous _ _ _ _ _ _.

28, the angle between the incident light and the plane mirror is 30, then the reflection angle is _ _ _ _, and the angle between the incident light and the reflected light is _ _ _ _.

29, a beam of light perpendicular to the mirror, the incident angle is _ _ _ _; If the plane mirror turns 20, the reflection angle is _ _ _ _, and the reflected light turns _ _ _.

30, we can see from different directions, such as the table itself does not shine, because the light shines on the object _ _ _ _; When reflected, every ray obeys the law of _ _ _.

3 1, the characteristics of flat mirror imaging: the image is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

32. A person with a height of 1.6 m stands 2 m in front of a mirror that can take full-body photos, and the image in the mirror is _ _ _ _ m； high; If a person approaches the mirror at a speed of 0.5 m/s, the distance between the posterity and the image after 2 s is _ _ _ m.

33, put a pencil on a flat mirror, if the pencil and mirror into a 45 angle, the pencil and its image angle is _ _ _ _.

34. The depth of the water in the pool is 3 m, the distance from the moon to the earth is 3.8× 105 km, and the distance from the image of the moon in the water to the water surface is _ _ _ _.

35, the car is driving at night, the car doesn't turn on the light because if the car is open, the glass window in front of the driver will let the driver see _ _ _ like _ _, which will hinder the road ahead.

36, light from air _ _ water or other media, refraction angle _ _ incident angle, light from water or other media obliquely into the air, refraction angle _ _ incident angle; In refraction, the optical path is also _ _ _

37. If light is vertically incident on the water surface from the air, the incident angle is equal to _ _ _ _ degrees, the refraction angle is equal to _ _ _ _ degrees, and the reflection angle is equal to _ _ _ _ degrees.

38. Put a coin at the bottom of an opaque empty cup and move the cup so that the eyes just can't see the coin. This is due to the principle of _ _ _ _, keep the position of the eyes and the cup unchanged, and slowly pour water into the cup. As the water level rises, you will see _ _ _ _, which is due to the principle of _ _ _.

39.1March 9, 997, a "total solar eclipse" occurred in Mohe area of China. The chart shows the positions of the sun, the earth and the moon during the total solar eclipse, so the position A in the chart is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

40. The following is an article from a publication. Please read it carefully and answer the questions as required.

Light pollution comes from beautiful glass curtain walls.

Miss Zhang has been very upset recently, because her house is facing the glass curtain wall of the new building like a flat mirror, and every move of the same household can be seen clearly. The reflection of the glass curtain wall also made her miserable. As long as it is sunny, her room is illuminated by strong reflected light, which affects her normal life, especially in the concave building. The glass curtain wall objectively forms a giant condenser, with dozens or even hundreds of square meters of concave lenses, and its condensing function is considerable.

(1) Find an optical physics knowledge from the text and fill it in line _ _ _ _ _.

(2) There is a scientific mistake in the article. Please underline the wrong sentences.

(3) From the above, find out an example of inconvenience or harm brought by a glass curtain wall to residents' lives _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

_______________________________________________________________________________

_________________________________________.

(4) How to prevent light pollution? Please put forward reasonable suggestions.

_______________________________________________________________________________

_________________________________________.

4 1. Many common things in life can be used to do physics experiments. What experiments can be done with existing glasses, pencils, white paper, glass plates and water? Requirements: Design at least two experiments and briefly write out the methods and steps of the experiments.

42. Give four examples of solving practical problems by using the straight-line propagation law of light (only one similar usage is counted).

43. In class, the sun shines into the classroom, and we feel the room is very bright. After class, the windows of the classroom are black from a distance. Why?

44. A beam of light inclines from the air to the water surface, as shown in the figure. Make the normal of point O and draw the general direction of refracted light.

45. In the picture, draw the position of reflected light, incident light or mirror according to the conditions given in the question.

46. According to the characteristics of plane mirror imaging, make the image of the object in the plane mirror in Figure 5- 15.

47. As shown in the figure, the light beam is incident at an angle of 30 with the upper interface of the glass brick. Please draw the general direction of the light emitted from the lower interface.

48. A beam of light emitted by the luminous point S in the water refracts into the air to form a virtual image, as shown in the figure. 1 refracted ray and incident ray are drawn in the figure, so what about their complete optical paths? Please draw it.

49. The experiment to study the imaging characteristics of flat mirror is shown in the figure, where A is _ _ _ _ _ (optional equipment name), and the finger is put on the candle flame to burn (optional "Yes" or "No").