"Refraction of Light" Light Phenomenon PPT Courseware 11

Description

"Refraction of Light" Light Phenomenon PPT Courseware 11

1. Refraction phenomenon

In the previous picture, the chopsticks in the water appear bent due to the refraction of light.

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

2. Characteristics of refraction

Take light incident from air into water as an example. The propagation direction of light is deflected after passing through the interface between air and water.

Refracted ray: When light is incident obliquely from one medium into another medium, the propagation direction of the ray is deflected.

The refraction of light follows the law of refraction:

The refracted ray, the incident ray and the normal are in the same plane; the refracted ray and the incident ray are separated on both sides of the normal; when light is incident obliquely from the air into water or other media, the refraction angle is smaller than the incident angle.

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

If light is allowed to hit the interface against the original refracted light, the light will be refracted against the original incident light.

3. Refraction in life

The fish are swimming in the clear water and can be seen clearly. However, if you try to spear the fish in the direction you see it, you won't be able to spear it. Experienced fishermen know that you can only reach the fish by aiming below it.

Typical examples

1. When light is refracted obliquely from one medium to another, the refracted ray is in the same plane as the incident ray and _____, and the refracted ray and the incident ray are separated in ____________. In the phenomenon of light refraction, when the incident angle gradually decreases, the refraction angle ____________________; when the incident angle decreases to zero degrees, the refraction angle ____________________.

2. As shown in the picture, a beam of light is emitted into the cup, forming a light spot at the bottom of the cup. Gradually add water to the cup, and the light spot will be ( )

A. Move right B. move to the left

C. Not moving D. unconfirmed

extracurricular extension

Mirage is actually caused by the refraction of light. When sunlight passes through the atmosphere, the phenomenon of light refraction is caused by the uneven density of the atmosphere (in physics, light enters from one medium into another medium or light passes through it). In the same inhomogeneous medium, light deflection will occur). Sunlight is refracted, making distant images appear closer. What we see is actually a virtual image in the distance that appears near. The phenomenon of mirages has been recorded in many eras, and most of the relevant modern reports are the legend of "Penglai Fairy Island". Do mirages exist? It is still a matter of controversy, and no scientist can really give a satisfactory answer. If mirages are indeed produced by the refraction of light, then the distant scenes should be real. Perhaps this answer will be truly revealed one day in the future.

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Update Time: 2024-09-07

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

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