"Reflection of Light" Light Phenomenon PPT Courseware 2

Description

"Reflection of Light" Light Phenomenon PPT Courseware 2

Knowledge goal:

1. Know the phenomenon of light reflection

2. Understand the law of light reflection

3. Understand the reversibility of light path in reflection phenomenon

4. Understand specular reflection and diffuse reflection.

Ability goal: Cultivate students' ability to observe, think, operate and summarize physical laws, as well as their ability to flexibly use knowledge to solve practical problems.

Emotional goals: Cultivate students' love for nature and life, stimulate students' interest in learning, and enable students to realize the importance of unity and cooperation and the joy of acquiring knowledge.

1. Why can we see the sun, electric lights and other luminous objects?

Because the light from the sun and electric lamps shines into our eyes.

2. Why can we still see people, books and other objects that do not emit light themselves?

Because the light reflected from people and books enters our eyes.

1. What is the reflection of light?

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

When light hits the surface of any object, reflection occurs.

2. What are the rules of light reflection?

Normal: a straight line that passes through the incident point and is perpendicular to the mirror (ON) - dotted line

Angle of incidence: the angle between the incident ray and the normal (i)

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

3. Is the optical path reversible in the reflection phenomenon?

What would we see if we let light shine on a plane mirror in the opposite direction of the reflected light?

In the phenomenon of reflection, the light path is ______.

Student A can see classmate B’s eyes through the plane mirror, then classmate B ___ can see classmate A’s eyes. (fill in "can" or "cannot")

Law of reflection of light (p40)

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 optical path is reversible (p41)

4. Specular reflection and diffuse reflection

Why is it that when a white paper and a plane mirror are placed in the sun, the strong light reflected by the plane mirror can only be seen at a certain angle? And when you look at white paper from any angle, it won’t feel particularly dazzling?

life phenomenon

What phenomena in life are mirror reflections? What are diffuse reflections? Can you give examples?

Practical application

What are the applications of light reflection in our society, life, national defense, and scientific fields?

practise

1. As shown in the figure: Make reflected light

2. As shown in the picture: What should I do if the blackboard is smooth and reflective?

Suggestions: Change the seating position of students, change the angle of the blackboard, or make the surface of the blackboard rougher.

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

4. 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 ______.

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

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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: 2024-12-10

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

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