SY+experiment

__ Refraction: Snell’s Law __ Seung Yeon Ro  1. Ruler  2. Glass Triangular Prism  3. Protractor  4. Various colors of pen  5. Paper  6. Laser  1. On a piece of paper put the prism on and mark the location.  2. Put the laser and mark the location of the laser.  3. Now shoot the laser and trace the laser with a colored pen.  4. Repeat steps 2 and 3 for two more times but use a different colored pen.  5. Using a protractor, find the angle of incidence, angle of refraction, for each trial.  6. Calculate the index of refraction. || || ||   Angle of Incidence(˚) Angle of Refraction(˚) || Index of Refraction(˚) || First Trial || 44 ||   1  ||   39.8030  ||  Second Trial  || 46.5 ||   2  ||   20.7847  ||  Third Trial  || 25 ||   35  ||   0.7368  || Unluckily, I think I have made some mistakes. I have used the same media, but I get different numbers for index of refraction. According to my experiment, results of the calculation of index of refractions were 39.8030˚, 20.7847˚, and 0.7368˚. The result of third trial seems most reliable because there were no hardships when I measured the angles. However, in the first two trials, it was hard for me to measure some angles. I was unable to verify Snell’s Law through my experiment. I believe that the angles were too small to measure with a protractor, or I measured the wrong angles. I am sure my calculations were correct.
 * Question ** : Would index of refraction change when angle of incidence is changed?
 * Hypothesis ** : According to the Snell’s Law, the index of refraction would not change unless the medium is different. So, if I use the same medium it would not change.
 * Background Information ** : Snell’s law says that the ratio between sine of angle of incidence and of refraction stays the same with the same media.
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