"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT

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"Laws of Imaging by Convex Lenses" Lenses and Their Applications PPT

Part One: Preview Perception

1. Explore the rules of imaging by convex lenses

1. Object distance.

The distance from the object to the lens _________ is represented by ______.

2. Image distance.

The distance from the image to the lens _________ is represented by ______.

3. Imaging rules of convex lenses.

2. Imaging rules and applications of convex lenses

1. The principle of camera.

u___________2f, becomes an inverted, reduced real image.

2. Principle of magnifying glass.

u___________f, forms an upright, enlarged virtual image.

3. The principle of projector.

f_____u_____2f, into an inverted, enlarged real image.

PPT on the rules of imaging by convex lenses, part 2: interactive classroom understanding

Convex lens imaging rules

1. When u=f, the object does not image.

2. Real images are all inverted, and virtual images are all upright.

3. Regardless of whether it is a real image or a virtual image, the closer the object is to the focus, the larger the image will be.

[Example] As shown in the figure, use a convex lens with a focal length of 10 cm to observe a picture printed with the emblem of the 2014 Nanjing Youth Olympic Games. At this time, the distance from the picture to the convex lens should be ()

A. Greater than 10 cm and less than 20 cm

B.Equal to 20 cm

C.Less than 10 cm

D. Greater than 20 cm

Analysis: This question examines the imaging rules of a convex lens. It can be seen from the figure that the convex lens forms an upright and enlarged virtual image at this time. When the object distance is less than one focal length, the convex lens forms an upright and enlarged virtual image.

Answer:C

PPT on the rules of convex lens imaging, part three: try to apply

1. Explore the rules of imaging by convex lenses

1. (2018·Yunnan Kunming High School Entrance Examination) As shown in the picture, if you want to get a clearly magnified image of the candle flame on the light screen located on the right side of the convex lens (the light screen is not shown in the picture), then the lit candle should be placed in the picture middle()

From the meaning of the question, a clearly magnified image of a candle flame is obtained on the light screen located on the right side of the convex lens. The image obtained on the light screen is a real image, that is, the imaging situation is an inverted, magnified real image. According to the rules of imaging with a convex lens, it can be seen that this When the object distance is greater than one focal length and less than twice the focal length, combined with the picture in the question, we can see that point c is between one focal length and twice the focal length, so the object must be placed at point c.

2. When exploring the imaging rules of a convex lens, an inverted and reduced candle flame image is obtained on the light screen. Move the candle closer to the convex lens by twice the focal length. Which of the following candle flame imaging situations is impossible to occur ()

A. Reduced real image B. Equally large real image

C. Magnified real image D. Magnified virtual image

3. When Xiao Wang used a light bench to do a convex lens imaging experiment, the image of the candle was formed on the upper side of the light screen. In order to make the image of the candle appear in the center of the light screen, the following operations can achieve the goal: ()

A. Move the convex lens upward B. Move the light screen downward

C. Move the candle up D. Move the candle down

2. Imaging rules and applications of convex lenses

4. As shown in the figure, a convex lens is placed near the light bulb, and a clear image of the filament appears on the far wall. Regarding this image, which of the following statements is correct ()

A. It looks like it is standing upright B. It looks like it is enlarged

C. Like a virtual image D. The image is brighter than the filament

5. (2018·Sichuan Zigong High School Entrance Examination) Regarding the application of convex lenses, which of the following statements is correct ()

A. The images formed by convex lenses are all real images

B. When taking pictures, the scene should be within twice the focal length of the lens

C. The slide in the projector is placed beyond twice the focal length of the lens

D. When using the magnifying glass, the object should be within twice the focal length

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For more information about the PPT courseware "Lens and its application, the rules of convex lens imaging", please click the "Lens and its application, the rules of convex lens imaging" ppt tag.

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Update Time: 2024-10-20

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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