"Reflection of Light" Light PPT Courseware 3

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"Reflection of Light" Light PPT Courseware 3

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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 reflection?

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

5. How does reflected light propagate?

Reflected light also travels in straight lines.

think about it

1. Why do we need to install a lampshade on the lighting lamp?

The lampshade can combine the upward light of the bulb with the original downward light by reflecting it downward.

2. Why should the classroom walls be painted white?

White walls are good for reflection.

extracurricular development

1. Changes in the pupils of the eyes?

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

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

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 real object, 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. Paint the walls in the room white to make the room brighter. ( )

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

Multiple choice questions

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 move from a weak light environment to a bright light, the pupils of our eyes will ( ).

A. Enlarge B. Reduce C. No change

3. The images in the plane mirror are all the same as the objects ( ).

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

Key points of this section:

1. When light hits a mirror, it will change the direction of propagation and be reflected back, forming a reflection phenomenon.

2. Reflected light also propagates in a straight line.

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For more information about the "Reflection of Light" PPT courseware, please click the "Reflection of Light ppt" ppt tag.

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Update Time: 2024-09-08

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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