I want a set of basic exercises on the imaging rules of convex lenses

Lens and its applications

1. Multiple choice questions (13×3 points = 39 points)

1. Regarding lenses, which of the following statements is correct? ( )

A. Light rays passing through a concave lens will never intersect B. Light rays passing through a convex lens will definitely converge to one point

C. A convex lens only converges parallel light D. A convex lens has Two real focus points

2. Which of the following four optical device imaging conditions is correct ( )

A. The camera forms an upright, reduced real image B. The projector forms an upright, enlarged real image Real image

C. The magnifying glass forms an upright, enlarged virtual image D. The periscope forms an upright, equal-sized real image

3. Among the following statements about real images and virtual images, which one is correct ( )

A. The real image is formed by the refraction of light, and the virtual image is formed by the reflection of light.

B. When seeing a real image, light enters the human eye, but when seeing a virtual image, no light enters the human eye. Light enters the human eye

C. The real image is reduced or enlarged, and the virtual image is enlarged

D. The real image can be taken on by a light screen, but the virtual image cannot be taken on by a light screen

4. After Xiaoli took a 1-inch registration photo, she wanted to take a 2-inch registration photo. What the photographer should do is ( )

A. Get close to Xiaoli Li, while stretching the camera forward B. Get closer to Xiao Li, and at the same time retract the camera

C. Move away from Xiao Li, while stretching the camera forward D. Move away from Xiao Li, and at the same time retract the camera

5. When Xiaoyang was doing an imaging experiment with a convex lens, he observed that a magnified image appeared on the light screen 20cm away from the convex lens. Then the focal length of this convex lens may be ( )

A. 5cm B. 10cm

C. 15cm D. 25cm

6. In convex lens imaging, if To obtain an image on the same side of the mirror as the object, the image must be ( )

A. A reduced, upright virtual image B. An enlarged, upright virtual image

C. Reduced and inverted real image D. Enlarged and inverted real image

7. As shown in the picture, when Xiaogang holds a magnifying glass and looks at the object through the magnifying glass, he sees ( )

< p>A. It can only be an upright enlarged image

B. It can only be an inverted and reduced image

C. It can only be an inverted and enlarged image

D. All three images can be seen

8. As shown in the figure, in the experiment of "Studying the Imaging Characteristics of Convex Lenses", a clear candle flame image appeared on the right light screen.

It is known that the focal length of the convex lens is f. From this, we can judge that the range u of the distance from the left candle to the convex lens is ( )

A. u< p>B. f＜u＜2f

C. u＝2f

D. u＞2f

9. Xiao Ming is doing it on the light bench Experiment on "Studying Imaging by Convex Lenses". When the relative positions of the candle flame, lens and light screen are as shown in the figure, a clear image can be obtained on the light screen. Judging from this, the focal length of the convex lens he used ( )

A. must be less than 8cm

B. must be greater than 20cm

C. must be between 8cm and 10cm between

D. Must be between 10cm and 16cm

10. When the object is 8cm away from the convex lens, a clearly magnified real image will appear on the light screen on the other side of the convex lens; If the position of the object and the light screen remains unchanged and the convex lens is moved 2cm toward the light screen, a clear reduced image will be formed on the light screen.

Then the focal length f of the convex lens is ( )

A. f＜2cm B. 2cm＜f＜4cm

C. 4cm＜f＜5cm D. 5cm＜f＜8cm

p>

11. In the following figure, what is the cause of myopia ( )

12. When observing objects with a microscope and ordinary astronomical telescope, have you ever paid attention to the uprightness and inversion of the image? If you haven't noticed it yet, please judge based on the optical knowledge you have learned. Regarding the upright or inverted image, the following statement is correct ( )

A. When observed with a microscope, the image is inverted. When observed through a telescope, it appears to be upright.

B. When observed through a microscope, it appears to be inverted. When observed through an astronomical telescope, it appears to be inverted.

C. When observed through a microscope, it appears to be upright. When observed with an astronomical telescope, it appears to be upside down

D. When observed with a microscope, it appears to be upright. When observed with an astronomical telescope, it appears to be upright

13. As shown in the figure Instructions: Xiaoqiang uses two magnifying glasses with different focal lengths in front of his eyes to observe objects in the distance. Which of the following statements is correct? Second magnification

B. Two magnifying glasses combined are equivalent to a microscope

C. Two magnifying glasses combined are equivalent to a telescope

D . After swapping the positions of the two magnifying glasses, the size of the same object is the same

2. Fill in the blanks (1 point for each blank, ***23 points)

14 . When the students discussed the issue of "how to survive in the wild", they asked: If there is no fire in the wild, how to make a fire

to keep warm? A classmate came up with a method of "cutting ice to make fire". You think that "cutting ice" means making ice; "making fire" means placing the object to be ignited in its place.

15. There are the following common types of mirrors: A. Plane mirror, B. Concave mirror, C. Convex mirror, D. Convex lens, E. Concave lens. Among them, the reflection of light is caused by ; the refraction of light is caused by ; the one that can condense the light is ; the one that can disperse the light is . (Fill in the letter code)

16. Xiaogang used a convex lens with a focal length of 10cm to conduct an experiment. The experimental device is as shown in the figure. During the experiment, the position of the convex lens remains unchanged. Please use the knowledge you have learned Complete the following fill in the blanks.

(1) Change the position of the candle so that it is at the 20cm mark,

Move the light screen again so that the candle flame becomes clear on the light screen

Real images of , .

(2) Change the position of the candle so that it is at the 35cm scale line, and then move the light screen so that the candle flame forms a clear real image of

and

on the light screen.

(3) Change the position of the candle so that it is at the 42cm scale line. Xiaogang can see the images of the candle flame through the lens from the right side of the convex lens.

17. Both students A and B are myopic, A’s vision is 0.4 and B’s vision is 0.8. Under normal circumstances, (optional "A"

or "B") the lens of the eye is thicker; they need to correct their vision and wear myopia glasses with higher powers and lenses

The focal length is more.

18. The far point of a normal eye is at , and the near point is approximately at ; the photopic distance is approximately .

19. In order to get clearer photos of celestial objects, the Hubble Space Telescope is placed outside to avoid interference.

20. When people look at the same object, there will be a phenomenon of "small in the distance and large in the near". This is related to the size of the angle of view between the object and the human's eyes, as shown in the figure. Show. When the same object is further away from the human eye,

the viewing angle becomes smaller. When a person is at the same distance from objects of different sizes, the viewing angle will be different.

The larger the object, the smaller the viewing angle. (Choose "big" or "small")

3. Drawing question (***14 points)

21. (6 points) As shown in the picture, please complete Light path diagram.

22. (4 points) Complete the optical path of the following lens.

23. (4 points) Draw a suitable lens in each of the following boxes and determine its position.

4. Exploration and Innovation Questions (***24 points)

24. (4 points) Xiaohong’s father is short-sighted and needs to wear glasses to correct it; his grandfather is far-sighted Eyes need to be corrected with reading glasses. Dad

Dad and grandpa’s glasses look exactly the same. One day, it was impossible to tell the difference between the two glasses when they were put together, so Xiaohong devised the following two methods to distinguish them. Please help Xiaohong complete the blank columns of the following table.

Touch with your hands

Name of glasses Mirror type Judgment basis

Myopia glasses Concave lenses

Reading glasses Convex lenses

Watch

Newspaper Name of glasses Mirror type Judgment basis

Myopia glasses Concave lenses

Reading glasses Convex lenses

25. (6 points) as shown in the figure As shown in the figure, in the experiment of observing the imaging of a convex lens, one of the steps is to adjust the height of the candle, the convex lens and the light screen in order to make the image of the candle flame. If the position of the convex lens remains unchanged, place the candle at points a, b, c, d, and e successively, and adjust the position of the light screen respectively:

(1) Place the candle at When the candle is placed at the point, the image that appears on the screen is the smallest;

(2) When the candle is placed at the point, the image that appears on the screen is the smallest;

(3) When the candle is placed at the point, when a clear image appears on the screen, the screen is the farthest from the lens;

(4) When the candle is placed at the point, no matter how you move the light screen, you will not get the image on the screen. The image of a candle flame, but can be observed through a lens (optional "reduced", "equal size" or "enlarged").

26. (5 points) In an experiment to explore the imaging rules of convex lenses.

(1) When the lit candle, convex lens and light screen are placed at positions A, O and B respectively as shown in the figure, a clear image will be obtained at C on the light screen

(optional "upright" or "inverted"),

(optional "zoomed out", "equal size" or "enlarged") candle flame (optional) Fill in "real" or "virtual") image.

(2) When replacing the original candle with another shorter candle, the position on the light screen (optional "C", "D" or "E")

Still get a clear image.

(3) If the lens does not move, move the candle to position B, and place the light screen at position A (optional "can" or

"cannot") and observe clearly The image of a candle flame.

27. (4 points) The rules of convex lens imaging are summarized from a large number of experiments, as shown in the following table:

Further analysis and synthesis of the above rules of convex lens imaging can also be The rules summarized are: (Just write two)

28. (5 points) I will give you a pair of reading glasses, a scale, and a piece of white paper. Please do it on a sunny day. To measure its power, complete the following simple experimental steps:

① Expose a lens of reading glasses to sunlight, and move the white paper behind the lens until a

, the brightest highlight.

② Measure the distance from the small bright spot to the lens.

③ Find the power of this lens from D = 100Φ=.

④ Use another lens, , to find out the power of the other lens.

Chapter 3 "Lens and Its Application" Unit Test Questions

Reference Answers

1. Multiple Choice Questions

1 2 3 4 5 6 7 8 9 10 11 12 13

D C D B A B D B C C D B C

2. Fill in the blanks

14. Convex lens, focus.

15. ABC, DE, BD, CE.

16. To reduce, to be inverted; to enlarge, to be inverted; to enlarge, to be erect, to be empty.

17. A, a, short.

18. Infinity, 10 cm, 25 cm.

19． Atmosphere, atmosphere.

20. Small, big.

3. Drawing questions

21. slightly. .

22. slightly.

23. Tips: Concave lens, convex lens,

4. Exploration and innovation questions

24. The middle is thin and the edges are thick, the middle is thick and the edges are thin; the characters become smaller and the characters become larger.

25. Presented in the center of the light screen; d, a, d, e, magnified.

26． (1) Inverted, reduced, solid.

(2)D. (3) Can.

27. (1) One time the focal length divides the virtual and the real, and twice the focal length divides the big and small. (2) When forming a real image, the near object becomes larger and the far image becomes larger, etc.

28. ① Directly opposite, smallest.

② Focal length f.

③.

④ Repeat the previous steps.