"How Light Spreads" Light PPT Courseware 4

Description

"How Light Spreads" Light PPT Courseware 4

Teaching goals and requirements

1. Be able to explain and explain that light propagates in a straight line;

2. Experience designing and verifying experiments on linear propagation of light;

3. Use the propagation laws of light to explain the causes of shadows.

How light strikes objects

When the sun shines into the house, have you ever seen the light shining into the door or window sill of your home? how is it like?

What does the light from car lights and flashlights look like when turned on at night?

Where do they come from? How does it illuminate the object?

Verify the propagation route of light

Are there any other ways we can verify the path of light?

Note: Do not point your eyes directly at strong light sources.

Thinking: Why is the shadow always on the backlit side?

Conclusion: Light travels in straight lines. Light travels very fast, about 300,000 kilometers per second. The distance of the sun from the earth is 150 million kilometers, and it takes about 8 minutes for the light from the sun to reach the earth.

Preparation for the next class: Preview "Reflection of Light" and prepare periscope learning tools.

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For more information about the PPT courseware "How Light Spreads", please click the ppt tag of "How Light Spreads".

"How Light Spreads" Light PPT Download:

"How Light Spreads" Light PPT Download Part One Content: Introduction to the New Lesson In the early morning, the sun comes out and the room is filled with sunlight; at night, you turn on the flashlight and the light illuminates the road ahead. When light illuminates objects around us, have we ever thought about where it comes from and...

"How Light Spreads" Light PPT:

"How Light Spreads" Light PPT Part One Content: Experimental Exploration Exploration Content: 1. How does light propagate? 2. How are shadows formed? Light propagates dispersedly. Light propagates in a straight line. Light propagates in all directions... How does light propagate...

"How Light Spreads" Light PPT Courseware 5:

"How Light Spreads" Light PPT Courseware 5 Key points of the previous section: 1. The direction of the shadow of an object under sunlight changes with the change of the direction of the sun. The shadow is always opposite to the direction of the sun. 2. The change in the length of the shadow of an object under sunlight is As the sun's position in the sky changes...

File Info

Update Time: 2024-11-14

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

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