In the figure below, a broad beam of light of wavelength 661 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 a wire of diameter 48.0 µm 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?
http://www.webassign.net/hrw/hrw7_35-44.gif
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