Summary- Refraction is the shift in direction of a wave caused by a change in wave speed. When light travels through different mediums, it is being refracted. The purpose of this lab is to test Snell’s law of refraction. Within geometric optics, when an incident ray comes into contact with an interface it will result in being partially reflected. Reflected rays abide by the law of reflection according to Snell’s Law. Materials that reflect a significant portion of incident light can sometimes appear to be shiny or lustrous. Transmitted rays obey Snell’s law of refraction, which is what is being tested and examined within this experiment. Anything that transmits a portion of light will have a clear appearance. Materials that are not able to transmit light will be opaque. Snell’s law is observed based on the study of light waves. Methods – For part 1 of the testing of Snell’s Law we were provided a Protractor, Laser and Top and Bottom Material (bottom material consisting of Air, Water and Glass. In the sequence of events we first set the following initial settings in the Bending Light simulator. Next we set the angle of incidence at 50 degrees as a control which will not change for the first part of the experiment. Next we will set the Material (top box) to Air which will not change. Throughout the experiment we change the “Index of Refraction” between 1.00 and 1.60 to complete 10 runs. For the first part of the experiment we proceeded to take measurements of the Angle of Refraction when changing the Index of Refraction of the bottom material increasing it by 5-10. As we increase the bottom Index the Angle of Refraction tended to decrease in degrees starting at 50 and ending at 28. Next in measuring the Angle of Incidence and leaving both Index of Refractions as control variables we can see that as the Angle of Incidence rose the Angle of Refraction consistently rose along with it. For Part 2 of this experiment, we left the top material for the Index of Refraction at 1.00 and the bottom material for the Index of Refraction at 1.33. We then proceed to change the Angle of Incidence and measure the Angle of Refraction. We increase the Angle of Incidence by 10 going from 10 degrees to 90 degrees, and then proceed to measure the Angle of Refraction. Snell’s law states that the angle of incidence is directly proportional to the angle of refraction. We can see in my data that this law is true. As the angle of incidence increase the angle of refraction also increases. The goal of this experiment was to verify Snell’s law and the law of reflection. The slopes collected from the graphs of each medium helped come to this conclusion. The first graphs, show that from the experiment we get, for reflection, the incidence angle and reflection angle are always the same, and for refraction, the incidence angle and reflection have a relationship between incidence angle and refraction angle. We can see in part 1, which the Angle of Refraction decreases in degrees, as the Independent variable is increased and the material changes from air to water. In part two the top and bottom material are left as a control and the Angle of Incidence is changed by 10 degrees from 10- 90 degrees, we can see the increase from 7 degrees to 49 degrees.