"Dispersion of Light" Colorful Light PPT Courseware 4

Description

"Dispersion of Light" Colorful Light PPT Courseware 4

1. Dispersion of light

Experimental exploration:

Animation demo:

Think about it: How many colors are mixed together in sunlight?

Experiments show that sunlight can be decomposed into seven colors of light: red, orange, yellow, green, blue, indigo, and violet.

Why does a rainbow appear in the sky?

Sunlight is produced by reflection and refraction through water droplets.

2. The “three primary colors” of light

animation demonstration

Red, green, and blue cannot be obtained by mixing other colors of light, but other colors of light can be obtained by mixing red, green, and blue in different proportions.

Experiments show that red, green and blue are the "three primary colors" of light

Question: How are the images of color TV programs produced?

3. Color of objects

1. Color of transparent objects

Experiments show that the color of transparent objects is the same as the color of the transmitted colored light.

2. Color of opaque objects

A colored opaque object reflects light of its own color. The color of an opaque object reflects the light it reflects.

Knowledge review

dispersion of light

light color

Dispersion: Sunlight can be decomposed into seven colors of light: red, orange, yellow, green, blue, indigo, and violet.

Three primary colors of light: red, green, and blue

Mixture of light:

color of object

The color of a transparent object: the same color as the light that passes through the object.

Color of an opaque object: The same color as the light reflected by the object.

The three primary colors of pigments: red, yellow, and blue

Color matching:

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"Dispersion of Light" Colorful Light PPT Courseware 3 [Experience] Dispersion of Light Activity 1. Prepare water, a container, a plane mirror, and a paper screen. Place the device as shown in the figure, and adjust the mirror angle to refract sunlight onto the white paper screen. Observe the color of the light on the paper screen. Activity 2. Put the CD...

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Update Time: 2024-09-29

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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