"Reflection of Light" Light Phenomenon PPT Courseware 7

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"Reflection of Light" Light Phenomenon PPT Courseware 7

Review the propagation of light

1. Light source - an object that can emit light is called a light source.

2. Light propagates along straight lines in the same homogeneous medium.

3. Light: Use a straight line with an arrow to represent the propagation path and direction of light.

4. The speed of light propagating in vacuum: 3×108 meters/second (3×105 kilometers/second)

5. Unit of length: light year

1 light year represents the distance that light travels in one year

2. Reflection of light

1. Reflection of light - The phenomenon of light hitting the interface of two media, changing direction and then returning to the original medium is called reflection of light.

2. Mirror surface: A smooth reflective surface is called a mirror surface.

Plane mirror: A mirror whose reflecting surface is flat is called a plane mirror.

3. "Three lines", "two corners", "one point"

4.Law of reflection of light

(1) The reflected ray, incident ray and normal are in the same plane.

(2) The reflected light and incident light are separated on both sides of the normal;

(3) The reflection angle is equal to the incident angle;

reflection type

1. Specular reflection - According to the law of light reflection, when parallel rays of light hit the mirror surface, the reflected light rays are still parallel rays. This reflection is called specular reflection.

2. Diffuse reflection - According to the law of light reflection, when parallel light rays are reflected by a rough surface, the reflected light rays are no longer parallel, but shoot in all directions. This reflection is called diffuse reflection.

practise:

1. The angle between an incident light ray and the reflective surface is 30°. At this time, the angle between the reflected light ray and the incident light ray is ( ).

2. Reflection phenomena are usually divided into two categories: one is ( ) and the other is ( ). Sitting in the classroom, you can see the words on the blackboard from all directions because the light is reflected ( ) on the blackboard. At this time, every light ray obeys the ( ) law.

4. When the angle between the incident light and the plane mirror is 60°, the reflection angle is ________

5. When light hits a plane mirror, if the incident angle is 200, then the angle between the reflected light and the incident light is _______

6. A beam of light hits a plane mirror. When the incident angle increases by 200°, the reflected ray is exactly perpendicular to the incident ray. Then the original incident angle is ________

7. Which of the following statements is incorrect?

A. Specular reflection follows the law of light reflection;

B. Diffuse reflection does not obey the law of light reflection;

C. After the parallel beam is reflected by the plane mirror, it is still a parallel beam;

D. The incident parallel beam in diffuse reflection is no longer a parallel beam after reflection.

9. The screen showing the movie should form:

A. Convergence of light;

B. Divergence of light;

C. Diffuse reflection of light;

D. Specular reflection of light.

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Update Time: 2024-10-19

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

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