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1. A light ray reflects off a plane mirror. What are the definitions of the angle of incidence and of the angle of reflection? What is the theoretical relationship between these angles? 2. A pair of students measure the refraction of light in passing from ace- tone into air for several angles. When the angle of incidence is 30, the angle of refraction is 42. What is the index of refraction n of the acetone? What is the angle of incidence when the refracted angle is the critical angle? 3. In the experiment of Sec. 2.5.3, you will determine the index of refrac- tion of styrene pellets in a foam prism at 10.5 GHz. The geometry of the experiment is shown in Fig. 2.9. The small angle of the prism is 20 and the incident beam strikes the front face of the prism at an angle of 90. The microwave signal is maximized when the receiver makes an angle of @ = T relative to the incident direction. What is the angle of incidence when the beam exits the prism 6;? What is the angle of refraction 6,? The index of refraction of the air surrounding the prism is 1.00. What is the index of refraction of the prism