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Science Fair Project 2012
Transcript of Science Fair Project 2012
2. A mounting device on which the laser device rests that can easily indicate where the beam is pointed (it will be difficult to actually see the laser beam passing through air).
3. A protractor or a homemade protractor that can easily indicate the angle of refraction inside the gelatin.
4.Gelatin, a clear or a light/transparent color would generally work best
5. Plastic containers to mold the gelatin Procedure Results 1. First, come up with your own experimental setup. In addition to understanding the theory behind the experiment, this project calls for much experimental design creativity
2. Make my gelatin extra hard
3. Mount the laser pointer on a pre-made device that will indicate where the beam is going and what the angle of incidence is
4. Fix the laser device and record the angle of incidence with respect to the normal.
5. Shine the laser through the gelatin (you may need another person to help out by holding down the button if you use a simple laser pointer) and measure the angle of refraction inside the gelatin.
6. Find the speed of light in gelatin: first use Snell's law to calculate the index of refraction of the gelatin and then apply the definition of index of refraction to find the speed of light in the medium. Purpose & Hypothesis When we shined the laser through the red gelatin, you could see refraction taking place, there was an estimated 25 degree of refraction. Of course it differs with how much Jell-O in the container, and we’d say It had a medium amount of jell-O. So we used Snell’s law of refraction to find the index of refraction in red gelatin, which later was founded to b 1.33. With this, we just divided the velocity of light through a vacuum which is 186,282 miles per second by 1.33, which is the index of refraction in red gelatin, and we got 140,000 miles per second through red gelatin. In conclusion, during this project, we’ve had to learn a lot about trigonometry and eleventh grade physics. This had to be accomplished so that in the end, we could find the velocity of light through red gelatin. So we had to use Snell’s law of refraction and his/her equation, (n1 (sin 01)=n2(sin 02), to find the index of refraction in jell-O which was 1.44. Once we got the index of refraction in red jell-O, we just divided the velocity of light through a vacuum which is 300,000 kilometers per second by 1.44, which is the index of refraction in red gelatin, and we got 229,000 kilometers per second through red gelatin. This is in fact, what we stated in my hypothesis that light speed through red gelatin would in fact decrease dramatically, but is still no different to the human eye. InConclusion