"Dispersion of Light" Light Phenomenon PPT Courseware 3

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"Dispersion of Light" Light Phenomenon PPT Courseware 3

1. Dispersion of light

[Dispersion Demonstration Experiment] Let a beam of sunlight shine on a prism. What happens to the light emerging from the prism?

Phenomenon: Sunlight (white light) is decomposed into seven colors of light after passing through a prism, which are red, orange, yellow, green, blue, indigo, and violet.

Concept: The process of decomposing white light into seven colors is called dispersion of light.

[Conclusion] Sunlight (white light) is a mixture of seven monochromatic lights: red, orange, yellow, green, blue, indigo, and violet.

Which of these seven types of light has the smallest deflection? Which deflection is greatest?

Red light has the smallest deflection, and violet light has the largest deflection.

The deflections from small to large are: red, orange, yellow, green, blue, indigo, and purple.

2. Mixing of color lights and three primary colors

So what happens after the seven-color light decomposed by a triangular prism passes through another triangular prism?

(1) Mixing of colored lights

Concept: We call the phenomenon of combining seven colors of light into white light called the mixing of light.

TV screens and computer screens are covered with fluorescent dots. These dots emit light in three colors: red, green, and blue. Why are these three colors used? Instead of using other colors?

(2) The “three primary colors” of light

Experimental research by scientists has shown that the three colors of red, green, and blue light in nature cannot be mixed with light of other colors.

Other colors of light can be obtained by properly mixing red, green, and blue.

Concept: Therefore, the three colors of red, green and blue are called the three primary colors of light.

(3) The “three primary colors” of pigments

Similar to light, pigments also have three colors that cannot be mixed with other colors, and these three colors can be mixed into different colors in different proportions. They are red, yellow and blue respectively. In order to distinguish them from the three primary colors of light, we call these three colors of pigments the three primary colors of pigments.

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

Question: If I illuminate a red object with blue light, what color will the object appear?

After studying the previous content, who can answer the following questions?

Why are the flowers red? Why are green leaves green again?

Since the flower is red and opaque, it absorbs light of other colors and reflects red light. The red light enters our eyes, so the flower appears red.

In the same way, because green leaves are green and opaque, they absorb light of other colors and reflect green light. Green light enters our eyes, so green leaves appear green.

practise:

1. Sunlight can be decomposed into ____________ seven colors of light.

2. The color of an object that can reflect light of various colors is: ( )

A. White. B. Colorless. C. Black. D. This color does not exist.

3. In the absence of any other lighting, the green light emitted by the stage spotlight shines on the actor wearing a white top and red skirt. The audience sees her ( )

A. Whole body is green

B. The top is green and the skirt does not change color

C. The top is green and the skirt is purple

D. The top is green and the skirt is black

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Update Time: 2024-10-25

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

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