PW 11 - Snell's Law Assignment This assignment covers sections PW 9, 10, and 1 1. 1. What is the speed of light in beryllium glass? 3 2. If light travels at 2.65 x 108 m/s in an unknown substance, what is the index of refraction? 3 3. For parts a and b, calculate and draw the refracted ray. All rays drawn must have appropriate arrows. All math must be shown. Angles can be rounded to the nearest degree. a) 4 air glycerin b) zircon sodium chloride 44. An incident ray strikes an oleic acid - crystal glass interface. If the refracted ray enters the crystal glass at an angle of 66.35', what was the angle of incidence? 3 5. The incident angle for a light ray hitting an unknown-crown glass interface is 28.7'. If the angle of refraction in the crown glass is 33.57", what is the index of refraction and the unknown substance? 4 6. A light ray travelling at 2.04 x 108 m/s through an unknown substance gets refracted into diamond at 25.0". What is the angle of incidence? 7. What is the critical angle for a fused quartz-water interface? Assume that light is originally in the fused quartz. 3 8. If light is originally in diamond and approaches an interface in which the critical angle is 31.0', what is the index of refraction for the other substance? 3