Physics 9B-C Quiz #5 Name: 10/31/2008 Last four of ID: A soap film is illuminated with blue (480 nm) light. The index of refraction of the film is 1.33 and has air on both sides. a) (5 pts) Find an expression for the phase difference between rays reflected from the top (1) and bottom (2) surfaces if the thickness of the film is t. For the top reflection from the soap film, ƒ 1 = π, or -π because the wave reflected from the glass will be inverted. The transmitted ray experiences a phase shift due to the path difference, 2
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