"Reflection of Light" Light Phenomenon PPT Courseware 3

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"Reflection of Light" Light Phenomenon PPT Courseware 3

Looking at objects such as glowing incandescent and fluorescent lamps, plane mirrors, polished metal surfaces, books, etc., we can see these objects because light shines from the objects into our eyes. What are the different sources of light entering our eyes from these objects?

The light emitted from incandescent lamps and fluorescent lamps is emitted by themselves. The light emitted into our eyes by other non-luminous objects comes from the light emitted by the light source towards the object.

1. Reflection of light

When light strikes the interface between two media, part of the light will be reflected and propagate back to the original medium. This phenomenon is called reflection of light.

Question: What rules follow when light reflection occurs?

Experiment: Explore the laws of light reflection

Take a guess:

What does the third line have to do with each other?

What's the relationship between the two corners?

Law of reflection of light (p74)

1. (Three lines are coplanar) Reflected ray, incident ray and normal are in the same plane

2. (Two lines are on opposite sides) Reflected light and incident light are separated on both sides of the normal line

3. (Two angles are equal) The reflection angle is equal to the incident angle (note the order!)

4. In the reflection phenomenon, the light path is reversible (p74)

Example 1: Given the incident ray in the picture, please draw the reflected ray.

Steps: 1. First mark the incident point O on the reflective surface

2. Draw the vertical line ON of the reflecting surface through the incident point, which is the normal line.

3. According to the law of reflection of light, the reflection angle is equal to the incident angle to draw the reflected light. As shown below

Example 2: It is known that the reflected light and the incident light form an angle of 90° as shown in Figure A. Please draw the position of the mirror.

Steps: 1. Draw the diagram as shown in A based on the known conditions.

2. Draw the angular bisector of the reflected ray and the incident ray, that is, the normal line ON (Figure B)

3. Draw the mirror surface based on the normal line being perpendicular to the reflective surface. (As shown in Figure C)

1. It is known that in Figure 1, a beam of light strikes a plane mirror at an angle of 60° to the mirror surface. The incident angle is ∠___, the reflection angle is ∠___, and the angle between the reflected light ray and the incident light ray is ___ degrees.

2. In Figure 2, if the incident light hits the mirror along BO, then the light path according to reflection is _____, and the reflected light must be emitted along ______.

3. Draw the incident ray in Figure 3 and mark the incident angle, reflection angle and their magnitude.

4. Complete the light path diagram in Figure 4.

5. Figure 5 shows the incident ray and reflected ray of the same light. Please draw a plane mirror.

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For more information about the "Reflection of Light PPT" PPT courseware, please click on the "Reflection of Light PPT Light Phenomenon ppt" tab.

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Update Time: 2024-07-30

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

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