A plate of plastic with parallel faces having a refractive index of 1.47 is resting on the surface of water in a tank. A ray of light coming from above in air makes an angle of incidence 34.0 with the normal to the top surface of the plastic. (Figure 1) Part A What angle 03 does the ray refracted into the water make with the normal to the surface? Use 1.33 for the index of refraction of water. Express your answer in degrees. View Available Hint(s) Figure nair nplastic 02 llwater 03 0 02 1 of 1 > 03 = Submit Previous Answers Incorrect; Try Again; 5 attempts remaining Review your calculations and make sure you round to 3 significant figures in the last step. Provide Feedback Using a fast-pulsed laser and electronic timing circuitry, you find that light takes 0.40 ns longer to travel down a zircon rod of length than to travel the same distance in air. The index of refraction of zircon is 1.923. Part A What is the length of the zircon rod? Express your answer in centimeters to two significant figures. n = Submit Request Answer Provide Feedback ? cm