| Category | Format | Size |
|---|---|---|
| People's Education Edition Physics for Grade 8, Volume 1 | pptx | 6 MB |
"Linear Propagation of Light" Light Phenomenon PPT Courseware 2
Description
"Linear Propagation of Light" Light Phenomenon PPT Courseware 2
magical light phenomenon
Objects that can emit light are called light sources
natural light source
1 huge fireball sun
2. The active night light——Fireworm
3 Colloidal substance - jellyfish
4 Ocean fish – lantern fish
artificial light
1 candle
2 oil lamps
3 neon lights
4 incandescent lamps
5 lasers
2. How light spreads:
Does light always travel in straight lines?
Experiment 1: Observe the propagation path of laser light in the air
Experiment 2: The laser beam hits the plane mirror and the reflection phenomenon is observed.
Experiment 3: The laser beam is shot on the glass brick and the refraction phenomenon is observed.
Experiment 4: The trajectory of the laser hitting the same inhomogeneous medium.
Conclusion: Light propagates along straight lines in the same homogeneous medium, and light is reflected and refracted at the interface between the two media.
3. Application of linear propagation of light
(1) Team alignment: "Align to the right!"
(2) Small hole imaging
The light passing through the woods will form a "spot" of the sun on the ground - an image of the sun.
(3) Formation of shadow
speed of light
1 The light from the sun takes about 8 minutes to reach the earth.
2 The speed of light in air is slightly smaller than the speed in vacuum.
3 The speed of light in water is about 3/4 of the speed in vacuum.
4 The speed of light in glass is about 2/3 of the speed in vacuum.
practise
1. When the weather is fine, you often see some bright small spots on the ground under the shade of trees. This is caused by light ___________. These spots are ___ shaped and are caused by ______ passing through the gaps in the leaves. Successful ____.
2. In some of the following life scenes, the characteristics of light propagating in straight lines in the same homogeneous medium are used ( )
A. "Hide from the sun" in the shade of trees B. Use a magnifying glass to observe small objects
C. Dressing in front of a flat mirror D. Standing on the shore and watching the fish in the water
3. Which of the following are light sources ( )
A.Sun B.Earth C.Moon D.House
4. The propagation speed of light in a vacuum is ________; among the sun, moon, and fireflies, the ones that are not light sources are ______; please give an example that illustrates the propagation of light in a straight line: _______________.
Summary: The speed of light
1. The fastest light in vacuum is C=3×108m/s
2. The speed of light in air is approximately less than the speed in vacuum. Therefore, we use 3×108m/s in our calculations.
3. The speed of light in other transparent media is smaller.
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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: 2024-07-31
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