In Fig. 33-22a, a beam of monochromatic light re- flects and refracts at point A on the interface between material 1 with index of refraction n = 1.33 and mater- ial 2 with index of refraction n = 1.77. The incident beam makes an angle of 50 with the interface. What is the angle of reflection at point A? What is the angle of refraction there? 50% 010 A (a) NI n2 Ads By MOMAGIC nz Ng Air (b) 002 B ** (b) The light that enters material 2 at point A then reaches point B on the interface between material 2 and material 3. which is air, as shown in Fig. 33-22b. The interface through B is parallel to that through A. At B, some of the light reflects and the rest enters the air. What is the angle of reflection? What is the angle of refraction into the air?