Purpose: To discover how light travels and learn about the physics of light. Light behaves like a wave and a particle. For more on light see Light Science for Kids.
- 3 index cards
- small piece of modeling clay or sticky tack
- hole puncher
- science journal
- For each index card, use a ruler to draw lines connecting opposite corners of the card.
- At the intersection of the two lines, use a hole puncher to punch a hole in the center of the index cards.
- For each card, use a small piece of modeling clay and place the card into the clay to create a "stand" for the card. Place the cards so that they stand vertically and at an equal distance from each other. See Diagram.
- Place the flashlight at one end of the row of index cards and turn off the light in the room.
- Arrange the index cards so that light can be seen through all the holes.
- Observe and record your observations.
- How can light be seen through all the index cards?
- What does the experiment prove about the path light travels?
- What would happen if the holes were smaller?
1. How can light be seen through all the index cards?
The holes are in alignment and the light travels in a straight line.
2. What does the experiment prove about the path light travels?
Light travels in a straight line.
3. What would happen if the holes were smaller?
The light would continue to travel in a straight line but in a more restricted path.
Reference: NASA SciFiles
More Light Experiments:
Light Spectrum - Learn about the light spectrum and what white light is made of.
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