"Dispersion of Light" Light Phenomenon PPT Courseware 5

Description

"Dispersion of Light" Light Phenomenon PPT Courseware 5

1 [Teaching Objectives]:

1. Understand the dispersion phenomenon of light and know the three primary colors of light and the three primary colors of pigments. Understand that the colors of transparent objects and opaque objects are determined by the color light they pass through and the color light they reflect respectively.

2. Explore the mixture of colored lights and the color of objects, acquire relevant knowledge, and experience the process and methods of inquiry.

3. Through observation, experiment and inquiry learning activities, cultivate students’ scientific attitude of respecting objective facts and seeking truth from facts, so that students can gain the joy of success and be willing to participate in physics learning activities

2 [Teaching Key Points and Difficulties]

1. Dispersion of light, mixing of colored lights

2. color of object

1. Dispersion of light:

1. The phenomenon that sunlight is decomposed into seven colors of light after passing through a prism is called dispersion of light.

2. White light is a mixture of seven monochromatic lights: red, orange, yellow, green, blue, indigo and violet.

Question: How is a rainbow formed?

Answer: There are a large number of tiny water droplets suspended in the sky after the rain. When the sunlight hits these small water droplets, it is broken down into brilliant seven-color light. Therefore, sometimes we can see the rainbow created by sunlight and small water droplets.

2. Color of objects

1. Explore the color of transparent objects

The color of a transparent object is determined by the colored light it transmits.

2. Explore the color of opaque objects

The color of an opaque object is determined by the colored light it reflects.

Black objects absorb various colors of light and do not reflect light at all.

White objects reflect various colors of light.

Class exercises

1. The color of a transparent object is determined by its ______ color light. For example, the red glass I saw is because the red glass allows _______ in the sunlight to pass through, while other types of color light are absorbed by the red glass.

2. The three primary colors of light are _____________.

3. The three primary colors of pigments are _____________.

3. Which of the following statements is correct ( )

A. White light is one of the seven colors of light

B. Any color light can cause dispersion of light when it shines obliquely on a prism.

C. Blue light cannot be obtained by mixing light

D. The formation of rainbow is the dispersion of light

4. When there is no other light, the green light emitted by the stage spotlight shines on the actor wearing a white top and red skirt. When the audience sees her ( )

A. The whole body is green

B. The top is green and the skirt remains unchanged

C. The upper body is green and the skirt is purple

D. The upper body is green and the skirt is black

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Update Time: 2024-11-21

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

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