"Plane Mirror Imaging" Light Phenomenon PPT Courseware 8

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"Plane Mirror Imaging" Light Phenomenon PPT Courseware 8

target guidance;

1. Understand the characteristics of plane mirror imaging through experimental exploration, and be able to use the characteristics of plane mirror imaging to explain phenomena in life.

2. Through reading and drawing, we know that the principle of imaging by a plane mirror is the reflection of light.

Characteristics of plane mirror imaging:

Guess through the experiment of looking in the mirror: What is the relationship between the position and size of the image and the position and size of the object? And give the reasons for your guess.

Conjecture: The distance between the image and the object to the mirror is equal. If the distance from the object to the mirror changes, the size of the image remains unchanged.

Reason for conjecture: When looking in the mirror, the person is far away from the mirror surface, and the image is also far away from the mirror surface. If you get closer to the mirror, the image will get closer to the mirror. The image size remains unchanged.

1. What is the difference between images and objects: left and right are opposite, and up and down are the same.

Design experimental plan

Read the textbook experimental plan and ask the following questions:

What experimental equipment is needed for this experiment? What are the experimental procedures?

2. Several questions about the design plan:

(1) Why use glass plates instead of plane mirrors?

Because the glass plate can both image and allow light to pass through, the position of the image can be determined.

(2) Why should the glass plate be perpendicular to the tabletop?

Only if it is vertical will the image of the candle be on the table. If it is not vertical, the image of the candle in front of the glass plate will be above or below the tabletop and cannot overlap with the candle behind the glass plate.

(3) Why use two identical candles?

It is to compare whether the image and the object are of equal size.

(4) Why use thin glass plates?

Because both the front and rear surfaces of the glass plate can reflect the image. The thinner the glass plate, the closer the two images can be seen as one image.

Thinking about the second and third boxes of reading textbooks:

5. The principle of plane mirror imaging: reflection of light

6. The difference between real image and virtual image:

The real image is formed by actual light and can be displayed on a light screen; the virtual image is not formed by actual light and cannot be displayed on a light screen.

7. Application of plane mirror

(1) Use it to create images in life: such as the mirror in the practice room and the dressing mirror at home.

(2) Save space: Use it to save space when wearing glasses.

(3) Change the propagation route of light: such as a periscope

Read "Convex and Concave Mirrors" and answer the following questions.

1. What is a convex mirror? What is a concave mirror? What is a spherical mirror?

A mirror that uses the outer surface of a ball as a reflecting surface is called a convex mirror

A mirror that uses the inner surface of a ball as a reflecting surface is called a concave mirror

Convex mirrors and concave mirrors are collectively called spherical mirrors

2. What effect does a convex mirror play on light? What does a concave mirror do to light?

Convex mirrors have a divergent effect on light, while concave mirrors have a convergence effect on light.

Their light paths all follow the law of light reflection

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Update Time: 2024-10-02

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

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