Materials:
* A flashlight or laser pointer
* A cardboard box
* A piece of paper
* A ruler or measuring tape
Procedure:
1. Set up the box: Cut a small hole (about 1 cm in diameter) in one side of the cardboard box.
2. Shine the light: Position the flashlight or laser pointer so that its beam shines directly through the hole in the box.
3. Observe the beam: Observe the path of the light beam as it emerges from the box. You should see a straight line of light.
4. Measure the distance: If you have a ruler or measuring tape, you can measure the distance between the hole and the point where the light beam hits the paper. This helps confirm the straight path.
Explanation:
* Light travels in a straight line: When light passes through a small hole, it travels in a straight line. This is because light waves travel in a straight path unless they are refracted (bent) by a medium like water or glass.
* The hole acts as a pinhole: The small hole in the box creates a pinhole effect. This means that only a narrow beam of light can pass through, making the straight path of the light more visible.
Variations:
* Multiple holes: Create multiple holes in the box and observe how the light beams from each hole travel in straight lines.
* Obstruction: Place a small object in front of the light beam and observe how the light casts a shadow behind it. This further confirms the straight path of light.
Important Note: Always be careful when using a laser pointer. Never shine it directly at someone's eyes.
