"Lens in Life" Lens and its Application PPT Courseware 3

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"Lens in Life" Lens and its Application PPT Courseware 3

Self-study materials

1. What are the main parts of a camera? What is its lens equivalent? What is the equivalent of film? What are the characteristics of the images of objects on film?

2． What are the main parts of a projector? What is its lens equivalent? What is the screen equivalent to? What is the function of a plane mirror? What are the characteristics of the image formed by the projection film on the screen?

3. What is the essence of a magnifying glass? What are the characteristics of the resulting image?

4. What causes real and virtual images? How to distinguish between a real image and a virtual image formed by an object?

think about it

1. What does the focus ring adjust?

Adjust the lens-to-film distance. The focus ring is a device on the camera that controls the telescoping of the lens.

2. What do aperture and shutter control respectively?

The aperture is the device in the camera lens that controls the amount of light.

The shutter is the device in the camera that controls the length of exposure.

3. What do shutter and aperture control together?

jointly control the amount of exposure.

Can you answer now?

1. Is the image smaller or larger than the object?

2. What are the positions of the image and object relative to the convex lens?

3. Like standing on your head or standing upright?

4. What is the function of film?

[Example 1] After taking a bust portrait, someone wants to use the same camera to take a full-length portrait. At this time, should he be farther away from the camera or closer? At the same time, adjust the focus ring to move the film away from the lens or closer to the lens?

[Analysis] When taking a bust portrait instead of a full body portrait, the image actually shrinks. At this time, the image distance should be reduced and the object distance should be increased at the same time.

[Answer] People should stay away from the camera while keeping the film close to the lens.

[Example 2] Xiaochen, a classmate, took a group photo of the whole class in front of the school gate. He found that the two students on both sides could not take the photo. Please help him solve this problem.

[Analysis] If the images of two classmates are put into the film, the images of the whole class will be shrunk.

When imaging with a convex lens, the object distance increases, the image distance becomes smaller, and the image becomes smaller. As long as Xiaochen moves back a little to increase the object distance, and at the same time shortens the distance between the lens and the film to reduce the image distance, he can take in the entire class.

[Answer] Please Xiaochen step back a little and shorten the distance between the lens and the film, so that the whole class can be photographed.

2. Projector

1. Structure of the projector

2. Principle of projector

The projector lens is equivalent to a convex lens, and the screen is equivalent to a light screen

Projector imaging features: inverted, enlarged real image

3. Use of projector

1. What is the role of plane mirror here?

Change the propagation path of light so that the image of the projection film appears on the screen in front of the projector

2. How should we display the slide film if we want to see it upright on the screen?

The slideshow needs to be played backwards

Class exercises

1. Which of the following is not an application of lenses in daily life?

A.Camera B.Magnifying glass C.Projector D.Periscope

2. The objects that can be enlarged into real images through the following optical devices are:

A.Camera B.Projector C.Magnifying glass D.Plane mirror

3. The "ginseng wine" currently sold on the market contains a ginseng soaked in a wine bottle. The ginseng you see should be:

A. The real thing of ginseng B. The same size image

C. Enlarged virtual image D. Reduced real image

4. Looking at the fish swimming in the tank from the side of a circular fish tank filled with water, what you see looks like ( )

A. Magnified virtual image of the fish B. Equal-sized virtual image of the fish

C. A reduced real image of the fish D. The actual fish

5. Which of the following statements is correct ( )

A. The eyes cannot directly see the virtual image. B. The eyes cannot directly see the real image.

C. The image that can be captured by the light screen may be a virtual image. D. The image that can be captured by the light screen must be a real image.

Classwork:

1. A ______ image of ______, ______ is formed on the negative film of the camera.

2. On the screen of the slide projector, a ______ image of ______, ______ is formed.

3. Looking at a bottle of canned bayberry from the side, each bayberry has become larger. What we see is the ______ image of ______ and ______. The round can and water together form a ______ mirror.

4. Complete the light path diagrams of the following figures

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For more information about the PPT courseware "Lens and its Applications in Life" PPT courseware, please click on the "Lens and Its Applications in Life" PPT courseware.

"Lens in Life" Lens and its Application PPT Courseware 8:

"Lens in Life" Lenses and Their Applications PPT Courseware 8 Learning Objectives 1. Know the imaging characteristics of cameras, projectors (slide projectors) and magnifying glasses. 2. Understand the main characteristics of real and virtual images of objects. Self-study 1. What are the main parts of a camera? it..

"Lens in Life" Common Optical Instruments PPT Courseware 3:

"Lens in Life" Common Optical Instruments PPT Courseware 3 Self-Study Materials 1. What are the main parts of a camera? What is its lens equivalent? What is the equivalent of film? What are the characteristics of the images of objects on film? 2． What are the main parts of a projector?

"Lens in Life" Common Optical Instruments PPT Courseware 2:

"Lens in Life" Common Optical Instruments PPT Courseware 2 Make some equipment: two paper tubes, convex lenses, and translucent paper. Take a look. Please pick up the camera you made and face it outside the bright window. Pull the paper tube to change the lens and semi-transparent paper. What do you see between the transparent sheets? ..

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Update Time: 2024-06-07

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

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