9. a) Find the angle of incidence 9 at the water-oil interface such that the condition for total internal reflection (at the oil-air boundary) is exactly satisfied. b) If 9 is decreased, is the reflection at the oil-air interface still total? c) What if 9 is increased? d) If the oil were not present, how would the answer in part (b) change? Note: noil =1.48, nwater =1.33. Air Oil Water

9. a) Find the angle of incidence 9 at the water-oil interface such that the condition for total internal reflection (at the oil-air boundary) is exactly satisfied. b) If 9 is decreased, is the reflection at the oil-air interface still total? c) What if 9 is increased? d) If the oil were not present, how would the answer in part (b) change? Note: noil =1.48, nwater =1.33. Air Oil Water