9. A beam of light initially passing through oil (noil = 1.45) is incident on water (nwater = 1.3) at an angle of 0; = 60°. The critical angle for these two substances is 63.7°. Which of the following statements is true? a) 100% of the incident beam is transmitted into water. b) 100% of the incident beam is reflected back into oil. c) Some portion of the incident beam is transmitted and the remainder is reflected. d) More information is needed to choose the best answer.

9. A beam of light initially passing through oil (noil = 1.45) is incident on water (nwater = 1.3) at an angle of 0; = 60°. The critical angle for these two substances is 63.7°. Which of the following statements is true? a) 100% of the incident beam is transmitted into water. b) 100% of the incident beam is reflected back into oil. c) Some portion of the incident beam is transmitted and the remainder is reflected. d) More information is needed to choose the best answer.