"How light spreads" Light PPT

Description

"How light spreads" Light PPT

Part One: Experimental Exploration

Explore content:

1. How does light spread?

2. How are shadows formed?

Light spreads dispersedly

Light travels in straight lines

Light spreads in all directions

PPT on how light spreads, part 2: class summary

Light travels in straight lines. The shadow is always on the side of the backlight; changing the position of the light source will change the shadow; the formation of the shadow can be regarded as the basis for the linear propagation of light.

PPT on how light spreads, part three: knowledge extension

If a kite is flying in the sky, its shadow will move with the kite; or if it is caught by a window gap, the shadow and the kite will be contrary to each other. The east kite will shadow the west, and the west kite will shadow the east.

If a falcon flies in the sky, its shadow moves with the falcon. If the shadow of the harrier is constrained by the window opening, the shadow and the hawk will move in opposite directions. If the hawk moves east, the shadow will move west, and if the hawk moves west, the shadow will move east. This is the phenomenon of linear propagation of light.

pinhole imaging

If a plate with a small hole is placed between the screen and the object, an inverted image of the object will be formed on the screen. We call this phenomenon small hole imaging.

How light spreads PPT, Part 4: Classroom exercises

1. Choice

1. The correct term for small hole imaging is ( )

A. The bigger the hole, the clearer it is. B. It’s related to the travel of light.

C. It looks like an inverted image of the scenery. D. All of the above are wrong.

2. The propagation speed of light is ( )

A.300,000 kilometers per second B.200,000 kilometers per second

C.300,000 meters per second D.200,000 meters per second

3.Light propagates along ( ).

A. Straight line B. All directions C. Diagonal line D. Scattered

2. Judgment

1. The direction of the shadow and the object is opposite. If the object is in the east, the shadow is in the west. ( )

2. The shadow of an object under sunlight does not change much throughout the day. ( )

3. The shadow of an object is always on the backlit side. ( )

PPT on how light spreads, part 5: homework

After class, in groups, they continued to complete the small hole imaging experiment and explained their experience.

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Update Time: 2024-08-30

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

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