Title: Index of Refraction of Water Objective: You will measure index of refraction of water and other material. Apparatus: Go t-oh s://I heteolorado.edu/sims/html/bendin7-l_i ht/late'st/bendinr-light enhtml Background Theory: Let's suppose that light waves encounter a plane surface of a piece of glass after traveling initially through the air. What will happen to the speed of light? The speed of light in glass or other transparent medium is lower than the speed of light in vacuum. The speed of light in a substance can be described by a quantity called the index of refraction as shown in the following equation. = E where V: speed of light in a substance, 0: speed of light in vacuum(3.0xlOBm/sec), n: index n of refraction of a substance. In this lab, you will measure the index of refraction of water. Experimental Method: 1. Place a protractor at the boundary of air and water. 2. Press a red button on the light source and set angle of incidence ath degrees and measure angle of refraction. Then increase angle of incidence with an increment of 5 degrees up to 60 degrees and measure corresponding angle of refraction. 3 Change material from water to material A and repeat above stepZ. 4. Calculate the index of refraction of water for each incident angle using 'Snell's law. nmersinewm = nairSlneair where n for air is 1000. Record values for \"water in the data table. Find the accepted value of the index of refraction of water from the simulation. ' Data: Index of refraction for water Index of refraction of material A