AP Physics 2 Quiz
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WAVES, SOUND, AND PHYSICAL OPTICS
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Monochromatic light in air is normally incident on a thin film on a substrate. The film's refractive index is greater than both air and the substrate. Reflections from the air–film surface and film–substrate surface return into air and interfere. The top reflection (low to high nn) undergoes a 12λ\frac{1}{2}\lambda phase shift, while the bottom reflection (high to low nn) does not. The film thickness is tt. Which condition produces constructive interference in the reflected light?
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