Rainbow From a Glass of Water Experiment


rainbow from a glassKids love rainbows. I am no more a kid but I too love rainbows and their colors. Naturally, rainbows are not common sights. They come and go after a rain or at least a drizzling. Not every rain results to produce a rainbows too. In this simple rainbow from a glass experiment we are going to make a rainbow with all its seven colors at our own home using a glass of water.

Try it yourself

You need:

  1. Glass tumbler – 1
  2. Water
  3. A piece of white paper

What next?

This experiment requires a good amount of sunlight. So, try this experiment on a sunny day only.

Step 1: Fill the gall tumbler with water.

Step 2: Place the white paper under direct sunlight.

Step 3: Place the glass of water on the white paper (under direct sunlight).

You will notice the rainbow appearing on the piece of white paper.


To understand the logic behind the results of this rainbow from a glass experiment, you need to know why rainbows appear. Rainbows are formed due to reflection, refraction, and dispersion of light. When light refracts as it passes through the water it bends (as in bend a pencil experiment) and separates the colors to display all of them as the seven colors (rainbow). If you want to learn more about rainbows, please refer to our rainbow facts here. Read more about rainbow fun facts here. 

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