With a pushpin, make a small hole in the center of the foil on your pinhole viewer. Next, use your finger to enlarge the hole. The hole should be a few centimeters in diameter. It can be ragged or circular in shape.
Make the room as dark as possible, then have your partner turn on the red and green lights that are mounted on the power strip while you position yourself about six feet (2 meters) away.
Orient the viewer so the foil side is facing the light source and the wax-paper side is facing you. Hold the viewer up to the light, about 8–10 inches (20 centimeters) from your face, and look at the light being projected onto the wax paper.
Try to get the light from the green and red bulbs to overlap. What do you notice? What techniques or modifications produce overlapping colors? Make sure you can get the colors to overlap before continuing.
Next, ask your partner to switch off the green light and turn on the blue light (leaving the red light on). What do you notice?
Ask your partner turn off the red light and turn on the green light and the blue light. What do you notice?
What do you see where the images of the colored bulbs overlap? Use this document to record your findings.
What you will see when all three lights (red, green, and blue) are turned on and overlapping? Try it and record your observations!