Method and Materials
- laser beam
- diffraction grating
- 5 gallon aquarium
- chip clip
- tracing paper
- coat hanger
- piece of wood
- expo marker (or other writing utensil)
- 3 text books
- rulers (or 50 cm of something else)
- duct tape
- maple syrup
- salt water (600 mL of water, 21 mL of salt)
- sugar water (600 mL of water, 21 mL of sugar)
- hydrogen peroxide
- rubbing alcohol (91% alcohol content)
1. Take two pieces of tracing paper and line them up over lapping about 7 inches.
2. Tape a part of a coat hanger to the top of the papers.
3. Tape the tracing paper to the aquarium.
4. Tape the diffraction grating to the other side of the aquarium.
5. Prop up the laser using the Chip Clips on the piece of wood.
6. Place the laser 4 inches away from the diffraction grating, pointing towards it.
7. Mark where the laser goes on the piece of wood.
8. Set up 2 text books 50 cm away from the tracing paper.
9. Prop up the iPad against the textbooks.
10. Put another textbook behind the iPad.
11. Pour the substance into the aquarium.
12. Turn on laser.
13. Take a picture on the iPad of the dots that appear on the tracing paper.
14. Turn off laser.
15. Remove laser
16. Put laser back in place.
17. Repeat steps 12-16 for 3 trials for each substance.
18. Measure the distance between the dots by using ImageJ.
19. Make calculations to find refraction index.
20. Clean out aquarium.
21. Repeat steps 11-20 for each substance.