How to make a rainbow out of a prism?

How Are Rainbows Formed?
    Sunlight or white light is a mixture of all the rainbow colors. The different rainbow colors are essentially mixed together to result in a white color. When light passes from one medium to another medium of a different density (e.g. from air to water), the light bends. This is known as refraction of light.
    How much a light is refracted depends on the wavelength of the light. The shorter the wavelength, the more it bends. Because lights of different colors have different wavelengths, therefore, white light is split up after passing from air to water and the individual colors become visible. This dispersion of light allows us to see the spectrum of colors that form a rainbow.


How can we see a rainbow without rain?
     One of the easiest and most visually stunning ways to see a rainbow is by using a
triangular prism.

How does a prism work to get a rainbow?
    1) Place a piece of white paper on the ground under the sunlight.
    2) Put the prism on or above the paper.
    3) Let a beam of light shines through a prism.
    4) Rotate and move the prism around until you see rainbow colors on the paper, the prism will distract the light into various colors of light as a rainbow.

What does a triangular prism could do for you?
     A triangle prism could lead children to an interesting optical physics experiment, it could used as a teaching tool for teachers to stimulate children's curiosity and exploration of the heart, letting them learn about the natural light and optical prism in an initial refraction of light perception experience.

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