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Authoritative PPT Summary
"Reflection and Refraction of Light" PPT
Part One: 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.
law of reflection of light
Reflected ray, incident ray and normal are on the same plane
Reflected rays and incident rays are on both sides of the normal
The angle of reflection is equal to the angle of incidence
law of reflection
1. The reflected light, the incident light and the 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.
Three lines are in the same plane, the normal line is in the middle, and the two angles are equal.
Reflection and refraction of light PPT, Part 2 content: Classroom experiment
Experiment: Explore the reflection of light from the surfaces of different objects
Task 1: What will happen if two parallel beams of light hit a smooth and flat surface (plane mirror)?
Task 2: What will happen if two parallel beams of light hit an uneven surface?
Think about it:
⑴The reason why movie screens use rough white cloth.
⑵Why does the blackboard reflect light?
What method can be adopted to avoid reflection?
Reflection and refraction of light PPT, Part 3: Classroom exercises
Exercise 1:
(1) Draw the reflected light;
(2) Draw the incident light in the middle picture
Draw the mirror surface in (3).
Exercise 2:
On a clear night after a rain, in order not to step on the accumulated water on the ground, experienced people often do this:
(1) Walk towards the moonlight. There is water on the shiny ground, so be sure not to step on it;
(2) Walk with the moonlight on your back. There is water in the dark places on the ground, so be sure not to step on it.
Can you explain the rationale for this?
Exercise 3:
1. The angle between a beam of light and the mirror is 25°, then the angle between the reflected light and the incident light is ____. If the angle between the incident light and the mirror increases from 25° to 90°, the reflection angle changes from ____ to ____.
2. A beam of light comes at an angle of 30° to the horizontal plane. In order to make the reflected light travel horizontally, at what angle should the plane mirror be placed to the horizontal plane?
Reflection and refraction of light PPT, Part 4: Plane mirror imaging
Characteristics of plane mirror imaging
1. A plane mirror forms a virtual image;
2. The size of the image and the object are equal;
3. The distance between the image and the object to the mirror surface is equal;
4. The line connecting the image and the object is perpendicular to the mirror surface.
Reflection and refraction of light PPT, Part 5: Compliance test
1. The image of an object in a plane mirror is ____, and the size of the image and the object are _____; the distance between each point on the object and its image and the mirror surface is _____, and their connection is ______ with the mirror surface.
2. Draw the image of object AB in a plane mirror
3. When a dancer is practicing, when he approaches the plane mirror, his image in the mirror will be ( )
A. Get bigger B. Get smaller C. Stay the same D. Unable to judge
4. The following pictures show the image of an object in a plane mirror. The correct one is ( )
5. What physical phenomenon does "the moon in the water that cannot be fished out, the flower in the mirror that cannot be picked" describe?
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