1) Set the upper material as water and the lower material as "Mystery A." 2) Turn on the laser and use the included protractor to measure the angle of incidence and the angle of refraction. 3) Set the angle of incidence to be the following angles and measure the resulting angle of refraction. 4) Use Snell's law to find the index of refraction at each angle and average your findings to find the index of refraction of the mystery material. Angle of Incidence Angle of Refraction |Index of Refraction 10 30 450 60 80 Calculated Average Index of Refraction (n,): Question: Why cannot the index of refraction of any material be less than 1