Is the angle of reflection equal to the angle of incidence? Is the angle of refraction less than, equal to, or greater than the angle of incidence? Snell's Law of Refraction states that ni sin 01 = n2 sin 02 . In the set up for step 11, medium 1 is air, my, the index of refraction of air equals 1, medium 2 is the plastic used to make the lens, n2 is the index of refraction of the plastic, 1 is the angle of incidence and 02 is the angle of refraction. Rearranging Snell's Law gives n2 = (n sin 01) / (sin 02) Using the measured values from step 11, calculate the index of refraction of the plastic. Continue to rotate the dial surface counter clockwise so that now the beam is incident on the curved surface of the lens. Set the angle of incidence to 40. Record the angle of incidence, the angle of reflection and the angle of refraction. Analysis: Is the angle of reflection equal to the angle of incidence? Is the angle of refraction less than, equal to, or greater than the angle of incidence? In the set up for step 13, medium 1 is the plastic, my is the index of refraction of the plastic, medium 2 is air, 72, the index of refraction of air equals 1, 0, is the angle of incidence and 02 is the angle of refraction. Rearranging Snell's Law gives n = (n2 sin 02) / (sin 01) Using the measured values from step 13, calculate the index of refraction of the plastic. Compare this value to the value obtained in step 12. Darken the room. Adjust the dial surface until the angle of refraction is 90. Record your observations. Record the angle of incidence. Turn off the laser. Carefully remove the semicircular lens and store it. Reflection and Refraction 4 8/27/18