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4. Thin Film Interference (20 pts) Incrdent 12 ita,-1.00 ngasoline 1.40 A thin film of gasoline floats on a puddle of water. Sunlight falls perpendicularly on the film and reflects into your eyes. The film has a yellow hue because destructive interference eliminates the color of blue (469 nm) from the reflected light. The refractive indices of the blue light in gasoline and water are 1.40 and 1.33. Determine the minimum non-zero thickness of the film.

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For destutve mtofrence , the pa diference behveeard 3must be Ana. 2 Hiekness in gesdline 22x 1.40 d- The minimom ^iickness (non-30so)- 167-S ni hrm

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