We will study about light today. Your day cannot work well without light. It gives you the ability to see things, forms, and colors. Your eyes' pupils filter light so that you can see everything around you.
Ask the children what are the sources of artificial light ? Torch, candle, flourescent lamp, lamp, etc. The main natural source of light is the Sun,
Energy that flows in straight lines is known as light. The light also bounces off objects and enters our eyes, helping us to see.
Let the student hold a torch and point to a boy's chest.
Ask the child,
1. Can you feel it?
2. Why it touches you? Catch the light. Were you able to hold it? No.
3. How does light travel? It travels from here to there when the torch light is on.
4. What do you notice about the light? It travels in a straight line. Do you notice the light rays from the sun is a straight line?
In this activity and with the help of the simple items, We will find out and prove that light travel in a straight line.
6 Cardboards or index cards
A hole Puncher
box with a spot.
1. Introduce the materials. Group the children into 3 to 4 groups. Instruct the children that their task is to hit the target with a torch light through the hole. Build a pathway or a wall made of cardboard. See how the light is passing through the hole.
2. Punch a hole in the center of the index cards or card boards. Do this for the other cards.
3. To make the cards stand up, use modeling clay. For this experiment to be successful, the cards must be arranged in a straight line, vertically, and at an equal distance from one another.
4. Place the torch or flashlight at the card's shorter end. Hold the flashlight in your hand so the spot it creates in the center of the box's hole is visible as you turn on the torch or flash light.
All of the openings must allow visibility of the light. When the last index card is reached, you should be able to see the light pass through each hole and land on a wall or other surface.
Questions for Discussion:
1. How can light be seen through the card boards or index cards? The holes are in a line and the light travel in a straight line.
2. How does light travel in a straight line? Light travels in straight lines mostly because it is a wave and prefers to cover the shortest path between two places. However, certain barriers might cause light to turn away from a straight path. This phenomenon is frequently referred to as diffraction.
3. What would happened if the hole in the card board is smaller? The light would continue to travel in a straight line but the light is very small.
4. What would happened if the way is curvy? The light is blocked and will not hit the target or spot.
Only when the holes are precisely in a straight line can torch be observed in this experiment. The light cannot be visible if any of the holes do not match up with the others. This demonstrates how straight-line light travels.
5. Consider and describe two real-life situations that demonstrate how light moves in a straight line.
The two examples that Light moves in a straight line, is we can see the shadow is created because light travel in a straight line. Another example is The image is created in a pinhole camera because light moves in a straight path.
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