| Category | Format | Size |
|---|---|---|
| Hunan Education Edition Third Grade Science Volume 2 | pptx | 6 MB |
"Light on the Mirror" colorful light PPT courseware
Description
"Light on the Mirror" colorful light PPT courseware
1. Reflection of light
Light travels in straight lines. When we block the path of light with a mirror, we will find that the light changes direction.
When light hits a mirror, it changes its propagation direction and is reflected back. This phenomenon is called reflection of light, also called reflection. Reflected light also propagates in a straight line.
look in the mirror
1. When you look at the cover of a science book in the mirror, what changes do you see in the image in the mirror?
2. Look in the mirror and write the word science on the paper so that the words in the mirror are correct. When observing writing, is the order of writing the same as usual?
3. Complete the two experiments carefully and fill in the table with the phenomena you see.
2. Plane mirror imaging
Activity:
Observe the image in a plane mirror:
Ask students to observe their faces with a plane mirror and think about the following questions:
(1) Are the face and face image the same size?
The size of the face and the image of the face are equal
(2) When you blink your right eye, does the image in the plane mirror also blink your right eye?
The image in the plane mirror is blinking the left eye
Characteristics of plane mirror imaging:
Ask a question:
What are the characteristics of plane mirror imaging?
Conjectures and Assumptions:
The size of the image and the object may be equal,
The image and object may be equidistant from the plane mirror.
Characteristics of plane mirror imaging
1. The distance between the image and the object to the mirror is equal
2. The size of the image is equal to that of the object
3. The line connecting the image and the object is perpendicular to the mirror surface
4. The upright virtual image formed by a plane mirror
3. The function of plane mirror:
1. Change the propagation direction of light
2. Imaging
Full-length mirror, make-up mirror, mirror behind display counter
The surface of a convex mirror is convex. When the light hits the convex mirror, it will not converge at one point, but will spread out. So it has a much larger viewing range than a plane mirror of the same size.
4. Convex mirror and concave mirror
1. Convex mirrors have a ______ effect on light
The object forms an upright and reduced virtual image in a convex mirror.
A larger area can be observed using a convex mirror.
2. Concave mirrors have a ______ effect on light
Can focus parallel light on one point
Application: Solar cooker
Can turn the light emitted at the focus into parallel light
Applications: Reflective devices for flashlights, car lights, and searchlights
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For more information about the PPT courseware "Colorful Light Shining on the Mirror", please click the "Colorful Light Shining on the Mirror" ppt tag.
File Info
Update Time: 2024-06-19
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