"Reflected Light" PPT courseware

Description

"Reflected Light" PPT courseware

reflection of light

1. How does light spread?

Light travels in straight lines.

2. What is the speed of light propagation?

The speed of light propagation is 300,000 kilometers per second.

3.How many minutes does it take for light to reach the earth from the sun?

It takes 8 minutes for light from the sun to reach the earth.

4. What is reflective?

When light hits a mirror, it changes the direction of propagation and is reflected back. This phenomenon is called reflection or reflection.

5. How does reflected light propagate?

Reflected light also travels in straight lines.

Light travels in straight lines, but when we block the path of light with a mirror, we find that the light changes direction.

When light hits a mirror, it changes its direction of propagation and is reflected back. This phenomenon is called reflection of light, also called reflection. Reflected light also propagates in a straight line.

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.

judge

1. After sunlight shines on the mirror, the original route can be changed. ( )

2. The size of the image in a plane mirror is the same as the actual size, but the left and right sides are opposite. ( )

3. The car's reflector is not a plane mirror, it does not use the reflection principle of light. ( )

4. Painting the walls in the room white will make the room brighter. ( )

5. Using mirrors, we can reflect sunlight onto the blackboard in the classroom. ( )

1. When light hits a mirror, it changes its propagation direction and is reflected back. This phenomenon is called light ( ).

A. Refraction B. Reflection C. Direct radiation

2. When we go from a weak light environment to a strong light, the pupils of the eyes will ( ).

A. Enlarge B. Reduce C. No change

3. The image in the plane mirror is the same as the object ( ).

A. Same B. Left and right opposite C. Up and down opposite

4. Which of the following is beneficial to the reflection of light ( ).

A. red B. black C. white

draw a picture

1. Please add two plane mirrors in the picture and place them in the correct position, and show the path of the light entering the lens tube in the horizontal direction.

2. In a dark room, why can I see the words on the book when the lamp is on? Please draw a map of the light's propagation route.

In daily life, which places or objects use the principle of light reflection? Please give 3 examples.

Searchlight, mirror, reflector

extracurricular development

Changes in eye pupils?

When the light is strong, the pupil constricts; when the light is weak, the pupil dilates.

After class, use a mirror to look at your eyes, move your head from darkness to light, and observe the changes in your pupils?

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Update Time: 2024-07-23

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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