"Linear Propagation of Light" PPT courseware on light phenomena

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"Linear Propagation of Light" PPT courseware on light phenomena

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"Linear Propagation of Light" PPT courseware on light phenomena

1. Light source

1. Objects that can emit light are called light sources

2. Light sources are divided into two categories: natural light sources and artificial light sources.

Discussion: Is the moon a source of light?

2. Propagation of light

1. How does light travel?

Experiment 1: How does light propagate in the air?

Spray a large amount of water mist into the air, use a laser pointer to shoot a beam of light in the water mist, and observe the path of light propagation;

(Small game: Fix a laser pointer on the classroom podium and use multiple small cardboards to receive the light spot formed by the laser from far to near, and fix the position to observe the arrangement of the small cardboards.)

Experiment 2: How does light propagate in water?

Add a small amount of milk to the water, use a laser pointer to emit a beam of light in the water, and observe the path of the light propagation;

Experiment 3: How does light propagate in transparent solids?

Use a laser pointer to shoot a beam of light into the translucent jelly and observe the path of light propagation in the jelly;

2. Describe the propagation of light (model method)

Usually, a straight line with an arrow is used to represent the path and direction of light propagation. Such a straight line is called a light ray.

3. linear propagation of light

a. Formation of shadow: When light encounters an opaque object during propagation, a shadow is formed behind the object.

b. Small hole imaging: Observation and demonstration experiments describe the characteristics of small hole imaging.

c.Solar and lunar eclipse (videos can be downloaded for students to watch)

3. Speed ​​of light

Read page 71 of the textbook; answer the following questions:

1. Thunder and lightning happen at the same time and in the same place. Why do we always see the lightning first and then hear the thunder?

2. What are the differences in the propagation of light and sound?

3. How fast does light travel in a vacuum?

4. Are the propagation speeds in other transparent media faster or slower than those in a vacuum?

Summary of the key contents of this section

straight line propagation of light

Conditions: In the same homogeneous medium

Phenomenon: shadow formation, pinhole imaging, solar and lunar eclipses, etc.

Application: laser alignment, queuing, shooting, etc.

The speed of light propagating in vacuum: 3×108m/s

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For more information about the PPT courseware "Light Phenomena: Linear Propagation of Light", please click on the "Light Phenomena ppt: Linear Propagation of Light" ppt tag.

"Linear Propagation of Light" Light Phenomenon PPT Courseware 8:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 8 Teaching Objectives: 1. Be able to identify light sources and know that light sources can be roughly divided into natural light sources and artificial light sources. 2. Understand the linear propagation of light and be able to list the applications of linear propagation of light in life. 3. Know the speed of light in vacuum..

"Linear Propagation of Light" Light Phenomenon PPT Courseware 7:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 7 Colorful Light Phenomenon 1. What is a light source? 2. How does light propagate? How to express the propagation route of light? 3. What are the applications of light propagation? 4. How fast does light travel? 5. The world of science: light years.....

"Linear Propagation of Light" Light Phenomenon PPT Courseware 6:

"Linear Propagation of Light" Light Phenomenon PPT Courseware 6 1. Light source 1. Light source: An object that can emit light is called a light source. 2. Light sources are divided into two categories: natural light sources and artificial light sources. Natural light sources: stars (such as the sun), fireflies, luminous jellyfish, etc. Artificial light source: electric...

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Update Time: 2024-11-19

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