EasyFunSchool has over 1,500 pages of free unit studies, science projects, recipe and craft ideas, history activities & many other resources to make homeschooling more enjoyable for both child and parent!

Rainbow In A Box

Here’s a really cool experiment for all ages.  This one helps you to determine whether a rainbow is formed by rain or by the sun.  It uses incredibly simple supplies as well.


White paper
Clear drinking glass


1. In the center of one of the narrow sides of the shoebox, cut a half inch slit that is just wide enough to let light through.
2. Trim the white paper to fit inside the bottom of the shoebox.  Affix the paper to the inside bottom of the shoebox.
3. Place the box in a window in the morning.  Be sure the sun can enter the box through the slit.
4. Fill the glass with water (note:  water must be clear, not cloudy).  Place the water-filled glass in the box up against the slotted opening.  Make that sure that the slit is still facing the sun.  What do you see on the paper?

What happens?  You see a rainbow on the white paper after you put the water-filled glass against the slotted opening.

Why?  Light travels in waves.  The light waves enter the box and when they hit the water they bend.  When light bends it means that the lightwaves spread out and group together according to their wavelengths.  Different wavelengths make different colors.  This is the same way a natural rainbow is made.


Copyright 2002-2015 FreeUnitStudies.com - All Rights Reserved.
Privacy Policy