"Refraction of Light" Light Phenomenon PPT Courseware 4

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"Refraction of Light" Light Phenomenon PPT Courseware 4

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

Review the methods of exploring reflection laws:

The positional relationship of the three lines and the size relationship of the two angles.

Explore the laws of refraction of light

guess

design experiment

Experimental results

1. The law of refraction of light

Refracted rays and incident rays are separated on both sides of the normal;

Refracted rays, incident rays, and normals are in the same plane;

When light rays are incident from air obliquely into other media, the refracted rays are deflected in the normal direction, and the refraction angle is less than the incident angle.

Want to discuss

If light is incident from water (glass) into air at an angle, will refraction also occur?

In which direction is light rays that hit the air deflected? Draw pictures to represent your ideas.

When light enters the air obliquely from other media, the angle of refraction > the angle of incidence.

Laws of refraction of light

Refracted rays and incident rays are separated on both sides of the normal;

Refracted rays, incident rays, and normals are in the same plane;

When light rays are incident from the air obliquely into other media, the refracted light rays are deflected like the normal line, and the refraction angle is less than the incident angle;

When light is refracted, the light path is reversible.

In addition, what other characteristics have you explored that produce refracted time?

When the angle of incidence increases, the angle of refraction also increases; when the angle of incidence decreases, the angle of refraction also decreases;

When light passes vertically from air into water, the direction of light propagation does not change.

2. Refraction phenomenon in life

What happens to chopsticks inserted into water?

The light reflected from the chopsticks refracts at the water surface and enters the eyes

Light is refracted through uneven atmosphere

When sunlight passes through the atmosphere and reaches the Earth, the light is bent.

What did you learn?

1. The phenomenon of refraction of light;

2. Laws of refraction of light;

3． The light path is reversible in the phenomenon of refraction.

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Update Time: 2024-11-21

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

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