"Reflection of Light" Light PPT Courseware 5

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"Reflection of Light" Light PPT Courseware 5

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 propagation direction and is reflected back. This phenomenon is called reflection of light, also called reflection. Reflected light also travels in straight lines.

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.

The surface of a concave mirror is concave. When light hits the concave mirror, the light converges at one point. Therefore, its observation range is much smaller than that of a plane mirror of the same size.

Activity 1: How does light illuminate books? Draw the path of light on the diagram.

Activity 2:

How to let the flashlight light shine on the book?

Draw the method we use and the path the light takes.

Activity 3: Light up the toys in the shadows. Draw a road map of our approach and light.

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. ( )

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

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.

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.

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 the dark to the light, and observe the changes in your pupils?

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Update Time: 2024-06-27

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

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