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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

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