"Lens in Life" Common Optical Instruments PPT Courseware 3

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"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? 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?

Discussion and exchange

1. What are the main parts of a camera?

The principle of camera

Principle: u>2f and f

1. The lens of the camera is equivalent to a convex lens, and the film is equivalent to the screen.

2. Characteristics of camera imaging: inverted, reduced real image

3. The object is ____ from the lens, and the image is _____ from the lens.

Cameras in life----digital cameras

Digital cameras use image sensors instead of film to convert light signals into electrical signals, and then into digital signals, which are stored in the camera's memory.

projector

1. What are the main parts of a projector?

The principle of projector

Principle: f2f.

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

Projector use

1. What is the role of a 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 slideshow if we want to see it standing upright on the screen?

The slideshow needs to be played backwards

Perspective related knowledge:

The wider the viewing angle, the clearer the observation of objects. The larger the image it forms on the retina.

The size of the viewing angle is not only related to the size of the object, but also related to the distance from the object to the eye.

Summary: What did you learn?

microscope

Make the observed object an inverted, enlarged real image

Magnify the real image formed by the objective lens into a virtual image again

magnify the image of an object

telescope

Make distant objects appear as inverted, reduced real images near the focus

Magnify the real image formed by the objective lens into a virtual image

Move the image of the object closer

magnify the image of an object

Practice in class

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

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For more information about the PPT courseware "Lens and Common Optical Instruments in Life", please click the Lens and Common Optical Instruments in Life ppt tag.

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Update Time: 2024-09-09

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

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