"Refraction of Light" Light Phenomenon PPT Courseware 8

Description

"Refraction of Light" Light Phenomenon PPT Courseware 8

1. Refraction of light

Definition: When light is incident obliquely from one medium into another medium, the propagation direction will be deflected, which is called refraction of light.

2. The law of refraction of light:

Students, please recall what the law of light reflection says?

"Three lines are coplanar" (reflected rays, incident rays and normals are in the same plane)

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

"Two lines are separated" (reflected light and incident light are separated on both sides of the normal line)

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

"The two angles are equal" (the angle of reflection is equal to the angle of incidence)

Observation summary:

When light is incident obliquely from air into water or other media, the refraction angle is smaller than the incident angle;

When light enters air obliquely from water or other media, the refraction angle is greater than the incident angle.

Knowledge expansion:

1. In the phenomenon of light refraction, when the incident light ray is close to the normal line, the incident angle is _____, the refracted light ray is also _____ the normal line, and the refraction angle is also _____. When the incident ray is far away from the normal, the angle of incidence is _____, the refracted ray is also _____ the normal, and the angle of refraction is also _____.

2. When light enters another medium from the vertical interface of one medium, the incident angle _____, the refraction angle _____, and the propagation direction of the light _____.

3. The path of light when refraction of light occurs is _____.

Class exercises

1. The water in the pool looks _________ than it actually is. This is caused by the ________ that occurs when light enters _________ from _________. What you see is a _________ image of the actual bottom of the pool.

3. Watching "fish swimming in the clouds" in the calm water by the lake, then ( )

A． "Fish" is a virtual image formed by the reflection of light, and "cloud" is a virtual image formed by the refraction of light.

B． "Fish" is a virtual image formed by the refraction of light, and "cloud" is a virtual image formed by the reflection of light.

C. “Fish” and “clouds” are both virtual images formed by the reflection of light

D. “Fish” and “clouds” are both virtual images formed by the refraction of light.

4. As shown in the figure, it is the route of light propagation in the two media of air and glass, where ________ is the incident light, ________ is the reflected light, ________ is the refracted light, the reflection angle is ________, and the refraction angle is ________ , the _____ side is air and the _____ side is glass.

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Update Time: 2024-11-23

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

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