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How To Make Rainbows

September 28, 2017 by Alice 2 Comments

Make rainbows - help kids explore the secret powers of light hands on #rainbows #light #STEAMPost includes affliate links, read here how these work.

Rainbows have a special magic, don’t they? They have the most awesome power to surprise, delight and inspire us.

And I’ve never met a child who didn’t marvel at that arc of colours in the sky when it appears.

BUT children almost just accept rainbows as something magical. Heck, us adults do too!

BECAUSE we all struggle to get our heads around the physics behind them.

I mean, how can all those colours in a rainbow appear from transparent light?

It can kind of defies our common sense understanding of the world, doesn’t it?

So this year, we’ve been loving this simple experiment for making our very own rainbows. They’ve delighted us but also let us see for ourselves physics in action.

And you can do the same for fun at home or in a classroom or home school lesson plan.

I’ll take you through the experiment in a moment and explain the physics behind the rainbows so do save the post for future reference and feel free to share.

And for more simple activities to explore nature with kids do check out my other ideas for exploring nature with children.

1. Rainbow Making Supplies

To make your rainbows you need nothing more than a basic prism. The five little ones in the video below cost us just £5 (roughly $5).

You may even be able to make do with some dangly earrings or bits of old light fittings.

And so much the better if you can because this helps children see science is all around us.

2. Make Your Own Rainbows

This experiment is so simple, it barely feels like an experiment. But WOW it’s powerful!

We simply hung 5 little prisms in a sunny window … and waited for the sun to shine …

https://sloely.com/wp-content/uploads/2017/09/MakingRainbows05-Video.mp4

And when it does, we have rainbows.

Lots of them.

We have rainbows dancing around the door frame as we come up the stairs …

https://sloely.com/wp-content/uploads/2017/09/MakeRainbows91Video.mp4

We have rainbows on the wall …

Make rainbows - help kids explore the secret powers of light hands on #rainbows #light #STEAM

And rainbows on the ceiling …

Make rainbows - help kids explore the secret powers of light hands on #rainbows #light #STEAM

We even get rainbows on the floor!

Make rainbows - help kids explore the secret powers of light hands on #rainbows #light #STEAM

And through those little prisms, we can actually see what’s going on. And start to understand not only what makes a rainbow …

… BUT also, something very cool about the fundamental properties of light!!

3. What Makes A Rainbow?

Our little prisms helped us see that white light is actually made up of a range of colours. That range of colours is what we call a spectrum.

When waves of light from the sun hit the prism – or a raindrop – they are bent. Or as it is called technically in physics refracted.

BUT different colour light waves are bent different amounts:

  • Violet light bends the most.
  • Red light bends the least.

So when light shines through a prism, the very bendy violet light emerges at a different point than the not so bendy red light.

And we can see the separate colours …

Make rainbows - help kids explore the secret powers of light hands on #rainbows #light #STEAM

All the seven colours of the rainbow bend slightly different amounts because they all have different wave lengths.

  • Each violet wave is shorter than the other waves and that’s why violet light bends more. And is at one end of the rainbow.
  • And each red wave is longer than the other waves and that’s why red light bends less. And is at the other end of the rainbow.

So that beautiful great arc in the sky actually appears when different coloured waves of light are bent different amounts through raindrops, depending on how long their waves are.

It’s still pretty magical isn’t it?

But understanding light is made up of different coloured waves of different lengths is a super powered building block for children to understand the physics of light and colour.

After making rainbows we loved this fun activity to explore a colour on the spectrum we can’t see BUT bees can …

How cool is that?

And I’ve got lots more light and colour experiments for you here including telescopes, kaleidoscopes, shadows and sunsets.

I hope you enjoy them as much we do.

And for even more inspiration check out all these other ideas for exploring nature with children.

Rainbow crafts for kids - the loveliest easy spring activity to explore the colors of the rainbow. Simple enough for preschool and kindergarten but includes science of light and color for middle school children #rainbow #spring #springcrafts #stpatricksdaycrafts #springactivities #kidscrafts #eyf

Rainbow science for kids - fun STEAM experiment to help children learn the colors of the rainbow and through a simple but awesome activity understand light waves. Easy to do in the classroom and at home. Great as part of a weather unit or as a St Patricks Day activity. #rainbow #scienceforkids #scienceexperiments #scienceactivities #stemeducation #stemforkids #weatherunit #stpatricksday #stpatricksdaycrafts

Science experiment for kids to explore light waves - a simple and fun but powerful activity for students from first grade and younger to middle school and KS2 to learn about color and refraction by making their own rainbows #rainbow #scienceforkids #scienceexperiments #scienceactivities #stemactivities #stemeducation #stemforkids #STEAM #ks2 #refraction #firstgrade
A lovely spring activity for kids to explore the colors of the rainbow - simple enough for early years, preschoolers, infants and ks1 but with enough cool science about light waves to challenge middle school children and seniors #spring #springactivities #springcrafts #springcraftsforkids #eyfs #earlyyears #rainbow #rainbowcrafts #scienceforkids #STEAM #STEM
Rainbow Science Experiment

Filed Under: Exploring Nature With Children Tagged With: slow parenting

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  1. 49 St. Patrick's Day Crafts for Kids | My Home Based Life says:
    July 12, 2018 at 10:20 pm

    […] How to Make Rainbows […]

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  2. Nature Journal Of A Chestnut Tree says:
    February 28, 2019 at 12:54 pm

    […] How To Make Rainbows […]

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