"Lens in Life" Lens and its Application PPT

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"Lens in Life" Lens and its Application PPT

Part One: Preview Perception

1. Camera

1. Structure.

(1) Lens: It is composed of a set of lenses, equivalent to ________.

(2) Film: equivalent to ________.

2. Imaging characteristics.

into a real image of ____________________.

2. Projector

1. Structure.

(1) Lens: equivalent to ____________________.

(2) Plane mirror: changes the ________ of light propagation so that the image of the projection film appears on the ________ of the projector.

(3)Screen: undertake the image of the slide film.

2. Imaging characteristics.

into a real image of ____________________.

3. Magnifying glass

1. Substance.

Is a________.

2. Imaging characteristics.

A virtual image of ____________________.

4. Real image and virtual image

1. Real image.

(1)Definition: ____________________.

(2) Features: Can be taken over by ________; objects and images are in the ________ of the lens.

2. Virtual image.

(1) Definition: It is formed by the ____________________ of reflected or refracted light.

(2) Characteristics: cannot be taken up by ________; objects and images are _________ by convex lenses.

3. Convex lens.

It can be either a ________ image or a ________ image.

Lens PPT in life, part 2: interactive classroom understanding

The principles and uses of magnifying glasses, cameras and projectors

1. Principle.

2. Use.

(1) When using a magnifying glass, the object should be placed within the focus, and the closer to the focus, the larger the image of the object.

(2) When the camera is close to the scene and the object distance decreases, the image distance will increase and the image will become larger. It can be summed up as the image of things near and far away. There is also a type of camera that can adjust the focus, so you can get a clear image without changing the object distance. When adjusting the focal length, when the focal length becomes longer, it is equivalent to the object distance becoming shorter, the image becoming larger, and the image distance also becoming larger while the focal length remains unchanged.

(3) When actually using a projector, the screen position is generally fixed. Adjusting the position of the convex lens (lens) can make the image clear; adjusting the front and rear positions of the entire projector can obtain a real image of the required size. To get an upright image, turn the slide upside down.

[Example] Convex lenses are important components of many optical instruments and can present different images. Which of the following statements about convex lens imaging is correct ()

A. Create an upright, reduced real image in the camera

B. Create an inverted and enlarged real image in the projector

C. Create an upright and reduced real image in the camera

D. When using a magnifying glass, create an upright, enlarged real image.

Tip: Equipment made using convex lenses includes cameras, slide projectors, projectors, video cameras, magnifying glasses, etc. Corresponding each device to the specific situation of convex lens imaging is the key to solving this type of problem.

Analysis: When taking photos and videos, what is obtained on the film behind the convex lens is an inverted and reduced real image; the projector produces an inverted and enlarged real image; the object passing through the magnifying glass forms an upright and enlarged virtual image.

Answer:B

Lens PPT in life, the third part: try the application

1. Camera

1. (2018 Guangxi Liuzhou High School Entrance Examination) As shown in the figure, the correct representation of the camera imaging principle is ()

The camera produces an inverted, reduced real image. A, B, and C are incorrect, and D is correct.

2. The “selfie artifact” brings convenience to travelers when taking selfies. As shown in the picture, compared with taking a selfie directly with a mobile phone, using a selfie stick can ()

A. Increase object distance

B. Increase the image distance

C. Increase the size of the portrait

D. Reduce the viewing range

Compared with taking a selfie with a mobile phone directly, the distance between the person and the lens is increased, that is, the object distance is increased, so for A, the image distance will be reduced, the image will be smaller, and the viewing range will be larger, so B, C, and D are wrong.

2. Projector

3. The working principle diagram of the slide projector is as shown in the figure. The lens of a slide projector is equivalent to a ________ mirror. In order for the audience to see the upright image, the slides must be inserted into the frame ________(optional "downward" or "inverted"). Illuminating the slide with strong light will cause the image on the slide to form a ________ (optional "real" or "virtual") image on the screen.

3. Magnifying glass

4. Xiao Ming did an experiment. He placed the candle and the convex lens in the position as shown in the picture. From the other side of the candle, he directly observed an upright and magnified image of the candle flame through the convex lens. Using this The imaging principle can be made ()

A.Plane mirror B.Camera

C. Slide projector D. Magnifying glass

4. Real image and virtual image

5. (2018·Yunnan Yuxi Simulation) Among the four scenarios shown in the figure, the one that becomes a real image is ()

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Update Time: 2024-07-11

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