"Propagation of Light" Light Phenomenon PPT Courseware 3

Description

"Propagation of Light" Light Phenomenon PPT Courseware 3

Explore questions:

1. In which materials can light propagate?

2. What route does light travel along in these substances?

3. Does light always travel along this route? Are there any restrictions?

Equipment provided: laser pointer, glass of water, jelly, table, books.

Explore: In which of the above substances can light propagate?

Conclusion: Light can propagate in transparent substances such as water and jelly.

Explore: the propagation path of light from the air to the water surface, and from the air to the surface of the jelly.

Conclusion: Light shoots from air to water, glass or in uneven air - it will be deflected

The propagation laws of light

Light travels in straight lines in the same, uniform, transparent substance.

Ray: A straight line that represents the path and direction of light.

Applications of light propagating along straight lines

Shadow formation:

When light encounters an opaque object during propagation, it will form a shadow behind the object because the light propagates in a straight line.

summary:

1. Light source: an object that can emit light

2. Conditions for light to propagate along a straight line:

In the same, homogeneous, transparent medium

3. Application of light propagating along straight lines

Shadows, sundials, laser collimation, eclipses, pinhole imaging, shooting, lining up, and more.

4. Speed ​​of light: C=3×108m/s (vacuum)

Test questions

1. Fill in the blanks:

1. The sun, moon, gems, and electric lamps can be called light sources. The propagation path of the light emitted by the light source can be represented by _______.

2. Light propagates at its maximum speed in ______, and this speed is ______km/s.

2. Choice:

1. Regarding the route of light propagation, which of the following statements is correct ( )

A. Light propagates in straight lines only in a vacuum

B. The path of light propagating in the same uniform transparent medium is straight

C. Light always travels in straight lines

2. The phenomenon that can be explained by the linear propagation of light is ( )

A. Shadow B. "Three points and one line" when shooting

C. Solar eclipse Lunar eclipse D. Pinhole imaging

think:

1. Are shadowless lamps really shadowless?

2. At noon, when a person moves under the sun, how will the person’s shadow change?

3. Homework:

1. Write a short paper with the title "If light does not propagate in a straight line in a uniform medium".

2. Make a homemade pinhole camera.

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Update Time: 2024-11-22

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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