Experiment for kids – Make a rainbow

Experiment for kids rainbow

In this easy science experiment for kids, we will see how to make a rainbow. We will discuss refraction, a physical phenomenon that enables rainbows to exist. We will also see why rainbows form arcs rather than straight lines.

Equipment of this experiments for kids:

  • A bowl
  • A small mirror
  • A white sheet of paper
  • A light source (an electric torch, a spot light…)
  • Water

Instructions of this experiments for kids:

  1. Fill the bowl with water.
  2. Place the mirror in the bowl, so that it is tilted at a 45 degree angle to the surface of the water. It should not be completely submerged. Half of the mirror should be outside the water.
  3. Once everything is set up, point the light source in the direction of the mirror and place the white sheet of paper on the reflection. You will be able to see the light spectrum on the sheet.

Explanation of this experiments for kids:

White light is made up of every color. When a ray of light passes from one medium to another (in this case, air to water and then water to air), it produces an effect of refraction. What is refraction? It is the deflection of light that occurs when the medium changes. Each color that makes up white light is deflected at a different angle. As a result, each color is separated and a rainbow is formed. The same thing happens in the sky when light hits water droplets.

Why is the rainbow curved ? Simply because the water droplets in which light is refracted are round, so the angle of the light changes as it exits the droplets.

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