| Learn about: rainbows, light, chromatography, spectrum, and color |
The rainbows that we see in the sky are caused by a reflection of the sun’s rays in drops of rain. There are also other ways to view a rainbow with the help of water and a few other supplies. You can even make a type of rainbow in the comfort of your own home. Materials: Coffee filter; paper clip; black and green water-soluble pens; saucer Procedure: 1. Fold the coffee filter into half. 2. Fold it again one more time. 3. Draw a dark green line about one inch (2-3 cm) from the round edge of the filter. (Be sure to save room for a black line next to it). 4. Proceed to draw a dark black line one inch (2-3 cm) from the other side of the round edge. (Do not let the lines touch each other). 5. Make the filter into a cone shape by securing the edge of the paper filter with the paper clip. 6. Place water in the saucer. 7. Put the round edge of the filter in the water. 8. Let the filter stay in this position for one hour and then observe the results. Now, explore! Pay close attention to what happens to the dark green line. Record your observations and explain what you think is happening during this experiment.
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