"Dispersion of Light" Light Phenomenon PPT Courseware 4

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"Dispersion of Light" Light Phenomenon PPT Courseware 4

Review and consolidate:

1·How many behaviors does light have? What are the differences?

2·What is refraction of light?

When the weather clears after the rain, sometimes there will be a beautiful rainbow hanging in the sky, which is very magnificent. How are rainbows produced?

1. Dispersion:

Sunlight (white light), after passing through a prism, is decomposed into light of various colors. This phenomenon is called dispersion of light.

2. Mixing of colors and lights

Red, green, and blue are called the three primary colors of light. Different colors can be mixed by using these three kinds of light.

Various colors of light are mixed from three colors of red, green and blue.

3. Invisible light

Sunlight has energy, so the reading on the thermometer will rise when exposed to sunlight.

The thermometer's reading will also rise outside of red light, indicating that there is a kind of light we can't see besides red light, which we call infrared.

Two characteristics of infrared:

1. The main characteristic of infrared rays is its strong thermal effect.

2. Infrared rays have a relatively strong ability to penetrate clouds and fog.

According to thermal effect

1·Medical infrared thermal imaging camera

2·Infrared thermometer

3·Infrared night vision device

4·Infrared heating

According to strong penetration

1·Remote control

2·Infrared remote sensing

UV applications:

1. It can kill microorganisms and is used for sterilization; ultraviolet rays are often used for sterilization in hospitals;

2. Ultraviolet rays can make fluorescent substances glow and identify the authenticity of banknotes;

3. Ultraviolet rays help the body synthesize vitamin D and promote calcium absorption.

4. Excessive ultraviolet rays can cause skin cancer and affect the survival of animals, plants and humans. The main function of sunscreen is to reflect UV rays.

Consolidation exercises

1. After sunlight passes through a prism, it will be decomposed into light of various colors. If a white screen is used to receive it, the order of colors on the white screen is red, _____, _____, ______, ______, ______, _____. this means________________.

2. The color of a color TV is produced by the electron gun in the TV shooting onto the phosphor on the inside of the screen. According to the mixing rules of color light, only three colors of electron guns, ______, ______, and _______, are needed in the TV. Can be matched with a variety of brilliant colors.

3. After the sunlight passes through the prism, it is decomposed into light of various colors. This shows that ( )

A. Sunlight is a mixture of various colors of light

B. There are small pieces of various colors in the prism

C. The prism has color changing function

D. A prism can turn monochromatic light into polychromatic light

4. The three primary colors of light are red, green and blue

5. White light can be decomposed into: red, orange, yellow, green, blue, indigo, violet and other colors of light.

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Update Time: 2024-11-22

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

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