"Light and Shadow" Light PPT Courseware

Description

"Light and Shadow" Light PPT Courseware

The conditions required for shadow production are

Have you ever played the hand shadow game?

Where did the shadow come from?

1. Understanding the light source

Note: The moon is not a source of light, it does not emit light on its own, it only reflects the light of the sun

Definition: An object that emits light by itself like a light bulb

Characteristics of shadow 1: The length and direction of the shadow of an object change with the change of the position and direction of the light source.

Characteristics of Shadow 2: The size of an object’s shadow is related to the distance between the object and the light source.

Characteristics of Shadow Three: The shape of the shadow of an object is related to the shape of the side of the object illuminated by the light source.

Summary of the whole lesson

What did you learn about light today? What patterns were discovered?

1. Light source: An object that is emitting light and emits its own light is called a light source.

2. Conditions for producing shadows: light source, obstruction and screen, and the obstruction must be between the light source and the screen.

3. Characteristics of shadow: the length and direction of the object’s shadow change with the change of the position and direction of the light source; the size of the object’s shadow is related to the distance between the object and the light source; the shape of the object’s shadow is related to the shape of the side of the object illuminated by the light source. related.

4. The shadow of an object illuminated from different sides is called projection, and projection is very useful in our lives.

Expansion exercises

1. What happens to the shadow when you change the position of the light source?

2. What happens to the shadow when the distance of the object from the light source is changed?

3. Let the light source illuminate different sides of your hand. What are the differences in the shadows you get?

judge

1. The moon on the fifteenth day is big and round, so the moon is a light source. ( )

2. As long as there is light, there will be shadow. ( )

3. Use a flashlight to illuminate an object from different angles and its shadow will have different shapes and sizes. ( )

4. The direction of the shadow has nothing to do with the position of the light, but the length is related to the position of the light source. ( )

5. Fireflies are also a source of light. ( )

1. Which of the following objects is a light source ( ).

A. Sun B. Moon C. Mirror

2. The direction of the object’s shadow is related to ( ).

A. The same light source illuminates from different directions. B. The same light source illuminates from different distances in the same direction.

3. Use a flashlight to illuminate the small rectangular wooden block from different angles to see the shadow of the wooden block on the wall ( ).

A. Same B. Different C. None

4. Use a flashlight to illuminate a ceramic basin from above and from the side, resulting in a shadow ( ).

A. Same shape B. Different shape C. Same direction

5. Use a flashlight to illuminate objects of the same length and distance from the wall to produce shadows ( ).

A. The same length B. Different lengths C. Different directions

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For more information about the "Light and Shadow" PPT courseware, please click the "Light ppt Light and Shadow ppt" tab.

"Light and Shadow" Light PPT download:

"Light and Shadow" Light PPT Download Part One: Situation Introduction Do students know what game this is? What are the conditions for the production of hand puppets and shadow puppets? ... ... ... Light and Shadow PPT, Part 2: Knowledge Exploration Light source, occlusion, and screen are shadows...

"Light and Shadow" Light PPT:

"Light and Shadow" Light PPT Part One: Conditions for Shadow Generation Play shadow games and think about how shadows are generated. Shadow puppetry is a kind of silhouette of characters made of animal skin or cardboard, which is performed with a light-proof cloth under the illumination of candles and other light sources. When performing, art...

"Light and Shadow" Light PPT Courseware 4:

"Light and Shadow" Light PPT Courseware 4 Conditions for Shadow Generation 1. Conjecture: Conditions for Shadow Generation 2. Experiment: Shadow Game 3. Group Report: Do we see the shadow of our own hands? What did we do to see it? What conditions are needed for a shadow to occur? ... ... ..

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Update Time: 2024-09-29

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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