"Dispersion of Light" Light Phenomenon PPT Courseware 8

Description

"Dispersion of Light" Light Phenomenon PPT Courseware 8

Review and consolidate:

1.Law of reflection of light

2. The law of refraction of light

3. Characteristics of plane mirror imaging

4. The difference between real image and virtual image

learning target

1. Can tell the seven colors of light into which white light can be decomposed.

2. Can talk about the three primary colors of light.

3. Can give examples of the applications of infrared and ultraviolet rays.

Sunlight (white light) is not monochromatic light, but is a mixture of various colored lights.

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

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.

The color of the TV screen is composed of three color bars: red, green and blue.

1.Spectrum

A prism can decompose sunlight into seven colors of light: red, orange, yellow, green, blue, indigo, and violet. Arranging them in order is a spectrum.

2.Infrared ray

⑴Strong thermal effect

Infrared oven, infrared dryer, infrared physiotherapy, infrared "heat map" (diagnosis of diseases), infrared night vision device, life detector

⑵Strong penetration ability

Infrared remote control

3.Ultraviolet rays

Invisible light beyond violet on the spectrum is called ultraviolet light.

⑴ Strong chemical effect. Easily sensitize photographic films

⑵Strong physiological effect. It can sterilize and disinfect. Excessive exposure will harm the human body.

Human synthesis of vitamin D

⑶With fluorescent effect, banknote detector detects banknotes

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.

practise

1. Among the following equipment, the one that uses infrared is ( )

A. Money detector B. Bathroom heating lamp

C.TV remote control D.Oven

2. The role of the ozone layer in the upper atmosphere is ( )

A.Absorb most of the ultraviolet rays from the sun

B. Absorb most of the ultraviolet rays from the earth

C. Block infrared rays from reaching the earth

D. Block infrared rays from emitting from the earth

3. Excessive exposure can make the skin rough at first, or cause skin cancer at worst ()

A. Ultraviolet ray B. Infrared ray

C. Both infrared and ultraviolet rays are possible

4. Appropriate amount of irradiation is beneficial to the body's synthesis of vitamin D and promotes the body's absorption of calcium ( )

A. Ultraviolet ray B. Infrared ray

C. Both infrared and ultraviolet rays are possible

5. The following phenomenon reflects the dispersion of light ( )

A. Sky after rain, arc-shaped light strip B. Trees on the shore, upside down in the water

C. Pencil in the water, broken at the surface of the water. D Frog at the bottom of the well, very little seen.

6. A beautiful rainbow sometimes appears in the sky after rain. Which of the following statements about "rainbow" is wrong ( )

A. It is the refraction phenomenon of light

B. It is the dispersion phenomenon of light

C. It is the reflection phenomenon of light

D. It is formed due to a large number of small water droplets suspended in the air.

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Update Time: 2024-09-08

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

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