"Dispersion of Light" Light Phenomenon PPT

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"Dispersion of Light" Light Phenomenon PPT

Part One: Preview Perception

1. Dispersion

1. Discovery: In the 17th century, British physicist ________ discovered.

2. Concept: The phenomenon of sunlight being decomposed into _______________ through a prism.

3. Seven colors of light: red, _______, _______, _______, _______, _______, _______.

4. Explanation: White light is made from a mixture of _______________.

2. Mixing of colors and lights

1. The three primary colors of light: _______, _______, _______.

2._______, _______, and _______ can be synthesized into other colored lights in different proportions.

3. Invisible light

1. The visible spectrum of the sun: A prism decomposes sunlight into _______________, which are arranged in a certain order.

2. Infrared ray.

(1) Definition: Invisible light outside the ______________ of the spectrum.

(2)Applications: Thermal spectrometer, ____________________, TV remote control, etc.

3. Ultraviolet rays.

(1) Definition: Invisible light outside the ______________ of the spectrum.

(2) Application: Promote the body's synthesis of vitamin D, ______________, anti-counterfeiting, etc.

Dispersion of light PPT, part 2: interactive classroom understanding

dispersion of light

1. Sunlight is composite light: After passing through a prism, sunlight is decomposed into seven colors of light: red, orange, yellow, green, blue, indigo, and violet. Therefore, sunlight is a composite light mixed by seven kinds of monochromatic light. .

2. When the sunlight passes through the prism, two refractions occur: (1) When the sunlight enters the glass (prism) obliquely from the air, it is refracted. (2) When sunlight is incident obliquely into the air through glass (prism), it is refracted.

3. Cause of dispersion: When sunlight is incident on a prism obliquely, the incident angles of the seven colored lights are equal. However, since the refraction angles of different colored lights are unequal, after two refractions, the seven colored lights propagate in different directions. We can see Seven different colors of light, this is the dispersion of light.

[Example] As shown in the figure, a mirror is placed at an angle in a basin containing water. When sunlight enters, colored light bands will appear on the opposite light screen. The following is the description and analysis of this phenomenon by students. The incorrect one is ()

A. The colored light strips are divided into seven colors

B. This phenomenon shows that white sunlight is a composite light mixed with seven colors of light.

C. Sunlight, like the seven colors of light, is a monochromatic light

D. Red light and purple light are located at both ends of the ribbon

Tip: Analyze the dispersion phenomenon of light, mainly in accordance with the following logical sequence:

Analysis: Sunlight is a composite light mixed with seven colors of light. After refraction, due to the different refraction degrees of different colors of light, the refracted light of different colors of light propagates in different directions, that is, sunlight is decomposed into seven colors of light to form colored light. band, dispersion occurs, so options A and B are correct. Among them, red light has the smallest degree of refraction and purple light has the largest degree of refraction. Therefore, red light and purple light are located at both ends of the ribbon, so option D is correct. Sunlight is composite light, not monochromatic light, so option C is incorrect.

Answer:C

Dispersion of light PPT, part 3: try application

1. Dispersion

1. The following phenomena belong to the dispersion of light ()

A. Mirage B. A rainbow appears in the sky after the rain

C. Reflection in water D. Formation of solar eclipse

"Mirage" is the phenomenon of refraction of light; "rainbow after rain" is the phenomenon of dispersion of light; "reflection in water" is the phenomenon of reflection of light; "formation of solar eclipse" is caused by the linear propagation of light.

2. Which of the following statements is correct ()

A. White is the purest color

B. White light is mixed with other colors of light

C. Sunlight cannot decompose

D. None of the above statements are correct

3. White light is refracted by a prism and then illuminated on the light screen to form light bands composed of red, orange, yellow, green, blue, indigo, violet and other colors. This phenomenon shows that white light is composed of _______ light.

2. Mixing of colors and lights

4. The schematic diagram of the three primary colors of light is as shown in the figure. Area 1 in the figure should be marked with _______ color, and area 2 in the figure should be marked with _______ color.

3. Invisible light

5. Which of the following statements is correct ()

A. The order of the spectrum is infrared, red, orange, yellow, green, blue, indigo, violet, ultraviolet

B. Infrared rays carry energy and can increase the thermometer’s reading.

C. Infrared rays are red, but the color is weaker

D. The object radiates infrared rays when the temperature is high, but does not radiate infrared rays when the temperature is low.

6. Although ultraviolet rays are invisible to the human eye, they have a very important relationship with human life. The following description of ultraviolet rays is incorrect ()

A. Appropriate ultraviolet rays help the body synthesize vitamin D

B. Ultraviolet rays can kill microorganisms

C. Excessive ultraviolet radiation may cause skin cancer

D.Can be made into ultraviolet night vision device

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Update Time: 2024-09-09

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

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