7. Light is going from glass into air, as shown below. The angle of incidence is 30°, and the index of refraction for the glass is n=1.4. Assume that the index of refraction for air is the same as for a vacuum (i.e., nair =1). What is the angle of refraction? At what critical angle would the light be "trapped" in the glass? What is the speed of light when it is travelling in the glass? a. b. с. glass air 02=??

8. Light strikes the 70° glass prism (n = 1.51) with an angle of incidence of 50.0°. Calculate the angle that the light leaves the prism. (73.9°) 70d 9. Light is incident on an equilateral Lucite prism (n = 1.5) at an angle of 35°. Calculate the angle that the light leaves the prism. (66°) %3D ? 10. Freddie the fish shines his flashlight upward from under water. If Freddie shines his flashlight at an incident angle of 20°, at what angle does the light leave the water? (27°) В. A. Beyond what critical angle will the light no longer be able to leave the water? (48.8°) 11. From inside an aquarium a ray of light is directed at the glass so the angle of incidence, in water, is 30°. (a) Determine the angle of refraction when the ray emerges from the glass into the air. (b) If the angle of incidence in the water is 52° at what angle will the rays emerge from the glass? (42°, no ray emerges) water air n = 1.33 n = 1.00 30° glass n = 1.50

Q1. A ray of light (ray a) in air (index of refraction=1) strikes a flat piece of glass at an angle of p0 = 84° with respect to the normal, as shown in the figure. The index of refraction of the glass is 1.5. What is the angle 0 between the reflected ray (ray b) and refracted ray (ray c) rays? (based on this question, answer from i to v) doi a 1 91 air glass 0. |02 C Fig. 1 nd the

20. A light wave is incident at 0 degrees to the normal approaching a plane mirror. What will be the angle of the reflected ray?A. 0B. 45C. 90D. 180