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Hold the spectrum up to a light, putting the viewing port (the paper tube) over your eye and aiming the viewing slit at a light. You should see the full light spectrum, from red to purple. Look at a candle flame, a flashlight, a street light, and so on by aiming the viewing slit at different lights. If you are having difficulty seeing the light spectrum, try adjusting the paper tube. Remember, it must be facing the disk inside the box. Use caution when examining sunlight: never look directly at the sun through the spectrum. If you want to observe the sun, look at the sunlight bouncing off of the clouds or a white wall. Record how different light sources look in the spectrum by writing down the light source (such as "candle flame") then using colored pencils to draw the colors you see. You can also use a camera to take a picture of the spectrum through the viewing port, although this can be a bit tricky. An incandescent light bulb produces a continuous spectrum of light with no bright lines because of the tungsten in it. A fluorescent bulb produces distinct, colored lines that come from mercury vapor. Hot gasses produce light that is made up of only a few colors, which the spectrum allows you to see individually. Some examples are: what colors were the individual bands of light reflecting? Was there an order to the colors? If so, name the order. Did different light sources look differently? How and why? Look for specific colors. Are all the colors of the rainbow present? Observe the spacing between the colored lines. Are they close or far apart? Spectrums make great science fair projects. Ask an adult for help finding out more information about your local science fair or other similar competition.
Examine different light sources. Record your observations. Ask scientific questions about the spectrum in class or with friends. Enter your spectrum and observations in a science fair.