"Lens in Life" Lens and its Application PPT Courseware 4

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"Lens in Life" Lens and its Application PPT Courseware 4

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?

answer the questions

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

2. Like standing upside down or standing upright?

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

The principle of camera

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

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 imaging characteristics

Like zoom out or zoom in?

Like standing upright or upside down?

Which is greater, image distance or object distance?

Are the image and object on the same side of the convex lens or on both sides?

Projector use

1. What is the role of a plane mirror here?

Change the propagation path of light so that the image of the slide appears on the screen in front of the projector.

2． If we want to see the upright image on the screen, how should we display the slide?

Transparencies should be played backwards.

real and virtual images

Real image: It is formed by the convergence of actual light rays and can be displayed on a light screen. For example:

Virtual image: It is formed by the intersection of the reverse extension lines of reflected light or refracted light, and cannot be displayed on the light screen. For example:

summary

The object passes through the camera and becomes an inverted, reduced image.

The object passes through the projector and becomes an inverted, magnified image.

We can see an upright magnified image of an object through a magnifying glass.

Note: The inversion, uprightness, enlargement and reduction here refer to the image of the object relative to the 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

4. When taking pictures with a camera, what you get looks like ( )

A． Upright, enlarged real image

B. Inverted, enlarged virtual image

C. Upright, enlarged virtual image

D. Inverted, reduced real image

5. Fish raised in a round fish tank look larger than real fish. This is because the round fish tank is equivalent to a ______, and the fish you see is ______ (fill in "real image" or "virtual image") , this image ______ (fill in "can" or "cannot") is carried out with a light screen.

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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: 2024-07-11

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

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