"Refraction of Light" Light Phenomenon PPT Courseware 13

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"Refraction of Light" Light Phenomenon PPT Courseware 13

review:

1.The reflection in the water is the ________ image formed by the Tower Bridge. is formed by ________.

2.What is the reflection of light?

The phenomenon that light incident on the interface of two media changes direction and then returns to the original medium.

Question: How do we see chopsticks in the water?

Light travels through water and air to our eyes.

Question: When light travels from one medium to another, such as when light travels from air to water, does the direction of propagation change?

The refraction rules of light incident from air into water:

1) The refracted ray, incident ray and normal are in the same plane;

2) The refracted ray and incident ray are located on both sides of the normal;

3) The refraction angle is smaller than the incident angle.

Is the refracted light path reversible?

Phenomenon: If light is allowed to hit the interface against the direction of the refracted light, then after being refracted, it will be emitted against the direction of the original incident light.

Conclusion: In the phenomenon of refraction, the light path is also reversible.

The refraction rules of light incident from water into air:

1) The refracted ray, incident ray and normal are in the same plane;

2) The refracted ray and incident ray are located on both sides of the normal;

3) The refraction angle is greater than the incident angle.

Summarize the laws of refraction of light:

1. The refracted ray, incident ray and normal line are in the same plane;

2. The refracted ray and incident ray are located on both sides of the normal line respectively;

3. When light is incident obliquely from air into another medium, the refraction angle is smaller than the incident angle;

4. When light enters air obliquely from another medium, the refraction angle is greater than the incident angle;

5. When light is incident vertically, the propagation direction does not change, and the refraction angle is equal to the incident angle;

6. As the angle of incidence increases, the angle of refraction increases.

Explain phenomena using refraction of light

Phenomenon 1: Why does the chopstick placed in the water seem to deflect upward?

Phenomenon 2: Pen misalignment

Phenomenon 3: Fish in the water appear shallower than their actual location

Phenomenon 4: What is the relationship between the position of an object in the air observed from water and its actual position?

Class exercises

1. When light is ejected from one medium into another medium, the direction of propagation occurs _________. This phenomenon is called _______ of light. When light passes from air into water or other media, the refracted ray _______ toward the normal.

2. Complete the light path diagram.

3. Which of the following phenomena belongs to the refraction of light ( )

A. Mirage B. The water in the pool looks shallower

C. Reflection in water D. Small hole imaging

4. If the refracted light is deflected toward the normal, the light may be ( )

A. shot diagonally from the water into the air

B. Shot diagonally from the air into the water

C. Shoot vertically from the water into the air

D. Shoot vertically from the air to the water

5. When the chopsticks are placed diagonally in a rice bowl filled with water, they appear to be bent, but if they are inserted vertically into the water, they will not bend. Why is this?

Answer: Because light is not deflected when it is vertically incident on the interface between air and water.

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Update Time: 2024-11-23

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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