"How light spreads" Light PPT download

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"How light spreads" Light PPT download

Part 1: Importing new lessons

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 it hits the object?

PPT on how light spreads, part 2: new lesson learning

Experiment: Let light pass through three small holes and leave light spots on the screen.

Where does the light spot fall?

1. Move the second sheet of paper forward or backward.

2. Move the second sheet of paper to the left or right.

3. Move the second piece of paper out a little further.

How light spreads PPT, Part 3: Classroom exercises

(1) Judgment questions

1. The speed of light is much faster than the speed of sound. ( )

2. Light can propagate in a curved form. ( )

3. The shadow is always on the back of the object. ( )

(2) Multiple choice questions

1. Light propagates in the air in the form of ( ).

A. Curve B. Straight line C. Wavy line

2. The speed of light propagating in air is ( ) per second.

A. 30 kilometers B. 300,000 kilometers C. 3 million kilometers

3. Which of the following examples cannot be explained by light propagating in a straight line ( ).

A. Solar and lunar eclipses B. The formation of shadows C. See lightning first and then hear thunder

PPT on how light spreads, part 4: Homework assignments

Explain how shadows are produced and why they are always on the backlit side?

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Update Time: 2024-09-09

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

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