"Refraction of Light" Light Phenomenon PPT Courseware 3

Description

"Refraction of Light" Light Phenomenon PPT Courseware 3

1. Refraction of light

1. Definition: When light is incident obliquely from one medium into another medium, the phenomenon that the direction of propagation changes is called refraction of light.

2. Incident angle and refraction angle

The angle between the incident ray and the normal is called the angle of incidence.

The angle between the refracted ray and the normal is called the refraction angle.

3. The law of refraction of light

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

② The refracted ray and the incident ray are separated on both sides of the normal line

③When light is incident from air into water or glass, the refraction angle is smaller than the incident angle.

④When light is incident obliquely from water or glass into the air, the refraction angle is greater than the incident angle.

⑤When light is emitted perpendicularly to the medium surface, the propagation direction does not change.

Class summary:

1. When light is incident obliquely from one medium into another medium, the direction of propagation generally changes. This phenomenon is called refraction of light.

2. The law of refraction of light

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

② The refracted ray and the incident ray are separated on both sides of the normal line

③When light is incident from air into water or glass, the refraction angle is smaller than the incident angle.

④When light is incident obliquely from water or glass into the air, the refraction angle is greater than the incident angle.

⑤When light is emitted perpendicularly to the medium surface, the propagation direction does not change.

3. In the phenomenon of refraction, the light path is reversible

Classwork:

1. When light slants from the air to the water surface, the refraction angle _____ the incident angle. When the light slants from the water into the air, the refraction angle _____ the incident angle.

2. When fishermen spear fish, they see the _____ image of the fish (fill in “virtual” or “real”). This is because light occurs _____ on the water surface.

3. Point out the optical knowledge contained in the following phenomena:

A. The "reflection" of the tree in the water _____;

B. The water in the pool becomes shallower. C. The effect is immediate _____;

D. The chopsticks inserted diagonally into the water bend upward _____.

4. Draw the refracted rays in each of the following diagrams:

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Update Time: 2024-09-08

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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