"Reflection of Light" Colorful Light PPT Courseware 4

Description

"Reflection of Light" Colorful Light PPT Courseware 4

When light hits the surface of an object, part of the light will be returned by the surface of the object. This phenomenon is called reflection of light.

Introduction to optical path

Normal: the vertical line passing through the incident point as the reflecting surface (ON)

Incident angle: the angle between the incident ray and the normal (i)

Reflection angle: the angle between the reflected light and the normal (r)

law of reflection of light

1. Reflected light, incident light, and normal are on the same plane (three lines are coplanar)

2. Reflected light and incident light are separated on both sides of the normal (normal is centered)

3. The reflection angle is equal to the incident angle (the two angles are equal)

Specular reflection demonstration

Features

The reflective surface is smooth and objects can only be seen from one direction

Specular reflection: When parallel light rays hit a smooth surface, the reflected light rays are also parallel.

Diffuse reflection demo

Features

The reflective surface is uneven and objects can be seen from all directions.

Diffuse reflection: Parallel light rays hit an uneven surface, and reflected light rays are emitted in all directions.

Multiple choice questions

A. Specular reflection follows the law of light reflection, while diffuse reflection does not follow the law of light reflection.

B. The reflected ray, the incident ray and the normal are not necessarily on the same plane

C. All reflections follow the law of light reflection

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Update Time: 2024-10-27

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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