First, let's think about this: Have you ever woken up in the morning, opened your eyes, and seen the beautiful sunshine streaming through your window? How about when you light a candle during a blackout, or when you see a bright torch at night? Without light, we wouldn't be able to see anything at all! Light helps us see the world around us, from the green leaves on a tree to the smile on your friend's face. What do you notice? This is just one example of how light makes everything visible. Can you see the details? That's light at work! Today, we have a big adventure ahead. We are going to learn about where light comes from — like the sun, a torch, or a jiko — that's called 'sources of light'. Then, we'll find out how different things around us behave with light. Does light pass through a window glass? Does it pass through a book? We'll find out! Finally, we'll dive into the mystery of shadows. Have you ever made a shadow puppet on the wall with your hands? Then you already know something about shadows! Before we jump in, I want you to pause and think about this question in your head: What would life be like if there was no light at all? Close your eyes for a moment and imagine... How would you play? How would you find your way home? How would you know if it's day or night? Think about it. We'll come back to this idea very soon. First, we are going to talk about sources of light. There are some lights that make their own light — like the sun, stars, and a burning candle. These are called 'natural' and 'man-made' sources. We'll look at examples that you see every day right here in Kenya!
Light can come from nature or from things people make. Natural sources are from nature. The sun, stars, and fireflies are natural. The sun gives us light during the day. Have you ever seen fireflies at night? They glow naturally! Artificial sources are made by humans. For example, a torch, a jiko – like the charcoal stove many of you have at home – and an electric bulb. All of these are artificial light sources. Here is a chart showing these sources. See the sun and torch side by side. Can you tell which one is natural and which is artificial? The sun is natural, the torch is artificial. Also notice the jiko and candle – both artificial. You know the two types of light sources!
Can you guess what they mean? Every material lets light through in a different way. Some let all light through, some let only some, and some block all light. Transparent materials let all light pass through. They are completely clear. For example, clear glass, clean water, or the plastic wrap on your lunch. You can see clearly through them. Next, translucent materials let only some light through. They scatter the light, so you cannot see clear images. Think of kitenge cloth – you can see light coming through but not the pattern clearly. Also frosted glass or a thin piece of paper. Finally, opaque materials block all light. You cannot see through them at all. Examples are a book, your desk, a wooden door, or a blackboard. Great job, everyone! You know the three types.
Great work, everyone! We started with where light comes from — natural sources like the sun and artificial sources like a torch or a lamp. Then we saw how materials behave when light hits them. Some are transparent, like a window glass — light passes right through. Others are translucent, like a thin kitenge cloth — light goes through but it's blurry. Some are opaque, like a cardboard box — light cannot pass at all. Remember, that's why we get shadows! When an opaque object blocks light, a shadow forms. If you move the object closer to the light, the shadow gets bigger — just like when you hold your hand near a torch. The next time you see your shadow under the sun, or you shine a torch through a bottle, think about what kind of material it is and where the light is coming from. Keep exploring — light is all around us!
