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In the figure, a broad beam of light of wavelength 525 nm is sent directly downward through the top plate of a pair of glass plates. The
plates are 120 mm long, touch at the left end, and are separated by 42 um at the right end. The air between the plates acts as a thin
film. How many bright fringes will be seen by an observer looking down through the top plate?
Incident light

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