beam of light is traveling in a large chunk of transparent plastic and strikes the smooth inner surface of the plastic, beyond which lies air. At which of the incident angles shown below (relative to the surface normal) would you expect 100% reflection of the light? (a) -5° (b) 5° (c) 95° (d) this is impossible

beam of light is traveling in a large chunk of transparent plastic and strikes the smooth inner surface of the plastic, beyond which lies air. At which of the incident angles shown below (relative to the surface normal) would you expect 100% reflection of the light? (a) -5° (b) 5° (c) 95° (d) this is impossible