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Rainbows are a great way to explore colours. You can make a rainbow inside your house with this easy experiment.
What You Need:
Fill the glass jar with water about two-thirds of the way. Place the mirror at an angle inside the glass jar. Close all the curtains/blinds in the room so that it’s completely dark. Now, shine the flashlight onto the mirror. A rainbow should appear on the ceiling or wall depending on the position of the mirror. If no rainbow appears, try changing the angle of the light or the angle of the mirror. The rainbow should appear eventually.
The reason why a rainbow appears is due to the splitting of the white light from the flashlight into its seven components. As light from the flashlight strikes the water surrounding the mirror, the water bends the light. Each of the colours in the white light bends at a slightly different angle, and this causes the colours to split apart; that’s why you see a rainbow.
This is what happens after the rain, when the water droplets in the atmosphere bend the sunlight and cause the sunlight to split into the seven colours of the rainbow. A rainbow's colours always appear in the same order: red, orange, yellow, green, blue, indigo, and violet.