"Reflection of Light" Light Phenomenon PPT Courseware 15

Description

"Reflection of Light" Light Phenomenon PPT Courseware 15

Want to discuss:

1. How does light spread?

2. Are the beautiful scenery we see the source of light? Where is the light source?

3. How did we see those beautiful scenery?

main mission

1. Understand the phenomenon of light reflection. Know what are incident rays, reflected rays, normals, incident angles, and reflection angles.

2. Understand the content of the law of reflection of light. Know that the reflection phenomenon of light is reversible in the optical path.

3. Know the difference between specular reflection and diffuse reflection and their applications.

4. Can draw according to the law of light reflection.

law of reflection of light

think:

1. What is a normal line?

2. What is incident light? What is reflected light?

3. What is the angle of incidence? What is reflection angle? How are they related?

4. What is the positional relationship between the normal, incident light, and reflected light?

can you answer that?

1. What is a normal line?

The perpendicular to the reflective surface drawn through the intersection of the incident light ray and the reflective surface is called the normal to the reflective surface.

2. What is incident light? What is reflected light? How do they relate to normals?

The light rays emitted from the light source to the reflective surface are called incident rays, and the rays reflected by the incident light rays through the reflective surface are called reflected rays. The incident ray, the reflected ray and the normal are in the same plane, on both sides of .

3. What is the angle of incidence? What is reflection angle? How are they related?

The angle between the incident ray and the normal is called the incidence angle, and the angle between the reflected ray and the normal is called the reflection angle. The angle of incidence is equal to the angle of reflection.

Think about it: What do these phenomena indicate?

1. When you look at other people's eyes in the mirror, others can also see your eyes in the mirror.

2. Place a mirror at the corner of the lane so that people standing at both ends of the lane can see each other.

These phenomena indicate that the optical path is reversible.

How to draw reflections of light

Drawing steps:

1. First draw the reflective surface.

2. Draw the vertical line (dotted line) of the reflective surface, label it with a name, and make a normal line.

3. Use a protractor to draw the incident ray and mark the incident angle.

4. Use a protractor to measure the reflected light and mark the reflection angle.

Note: It is important to do the line first, the angle of incidence = the angle of reflection.

practice

(1) Regarding the reflection of light, which of the following statements is wrong ( )

A. The reflected ray is in the same plane as the incident ray and normal

B． Reflected rays and incident rays are separated on both sides of the normal

C. As the angle of incidence increases, the angle of reflection also increases

D. The angle of incidence is greater than the angle of reflection

(2) The angle between the incident light and the reflected light is 60°, then the angle between the reflected light and the mirror is ( )

A. 60°B. 30°C． 120° D． 150°

(3) A can see B’s eyes from a mirror, then B can see from this mirror ( )

A. You must see A’s eyes

B． You must not be able to see A’s eyes

C. You may or may not be able to see A’s eyes

D. The position of the mirror is different, the results are different

Think about it, right?

(1) There is essentially no difference between the reflection of a tree in the river and the shadow of the tree on the ground. ( )

(2) When diffuse reflection occurs, the reflected light, incident light and normal are also in the same plane. ( )

(3) On a clear night after a rain, when a person walks with or against the moonlight, any shiny place on the ground should be filled with water. ( )

Class summary

What did we learn in this lesson?

What did you gain from this lesson?

Operation

Complete questions 1, 2, and 3 on page 66 of the textbook.

Collect information: Where do we use the reflection of light in our lives.

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Update Time: 2024-10-19

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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