How to Make Rainbows With Prisms
- 1). Tack your white paper or canvas to a wall with thumb tacks. Make sure the paper or canvas is flat and smooth so it can capture the rainbow perfectly. You can set it up across the room from a sunny window or use a flashlight if windows are unavailable.
- 2). Hold your prism up in front of the paper or canvas, making sure to catch the light from the window. If using a flashlight, hold the prism in your non-dominant hand and the flashlight in your dominant hand. Turn it on and hold the prism in the light beam.
- 3). Twist and turn the prism in the light source. Light should fall on the canvas or paper. Turn the prism until a corner of the triangle falls into the light beam. Light should refract through the prism and create a rainbow on your white background.