Turn on the light and align the protractor with the normal to the surface where the light ray is incident on it. Set the laser to an angle of incidence _1 of 15^o. Remember that angles are always measured from the normal. Observe the reflected and refracted rays of light. Use the protractor to measure the angles of incidence _1, of reflection _2, and of refraction _3 and record them in Table 1. Measure the angle made by the reflected and refracted rays of light with the normal for seven more incidence angles (of your own choosing) and record them in Table 1. the index of refraction for air: n_1= the index of refraction for glass: n_2=