Activity 13.7

Today we'll be discussing how light behaves when it hits different surfaces. First, can anyone tell me what they think happens when light strikes a mirror?

I think it bounces back!

That's correct! We call that reflection. Now, what do you think happens to the colors in sunlight when it reflects off a surface, like a mirror?

Maybe it shows colors like a rainbow?

Exactly! This process is called dispersion. When we see a rainbow, it's sunlight being dispersed by water droplets in the atmosphere. Today, we'll recreate this effect with a simple activity using a bowl and a mirror.

Let's start our activity. Take your bowl and fill it with water. Now place the mirror inside at an angle. Who can tell me why we're using water?

Is it to make the light split into colors?

Right! The water acts as a prism, helping to refract the light. Once you've set it up, position the bowl so that sunlight can reflect off the mirror onto the wall. What do you expect to see?

I think we’ll see different colors!

Good prediction! Let’s see if you're correct. Please turn the bowl until you notice the colors appearing on the wall.

Now that you can see the various colors reflected on the wall, can someone identify what colors you see?

I see red, blue, and green!

Great! These colors are part of the spectrum of light. Can anyone explain why sunlight is referred to as white light if it contains so many colors?

Maybe because we can't see all the colors when they're mixed together?

Exactly! When all these colors mix, they appear white to our eyes. This is also why clouds can look white! Remember, this experiment shows us not only how light behaves but also how essential it is in our world.

Can anyone think of other examples where we might see dispersion of light in nature?

Rainbows after it rains!

What about light coming through a prism?

Exactly! Both are examples of dispersion. It's fascinating how the principles we learn in class have real-world implications. The science behind how we perceive colors helps us understand natural phenomena.

So, to summarize: what did we learn about light today?

That light can bounce off and reflect colors!

And also that sunlight is actually made up of different colors!

Exactly right! Remember, the next time you see a rainbow, you'll know it’s sunlight being dispersed. Light is an essential part of our understanding of nature.