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In the figure below, a broad beam of light of wavelength 520 nm is incident at 90° on a thin, wedge-shaped film with index of refraction 1.45.
Transmission gives 13 bright and 12 dark fringes along the film's length. What is the left-to-right change in film thickness? Answer in m. Please help!


In The Figure Below A Broad Beam Of Light Of Wavelength 520 Nm Is Incident At 90 On A Thin Wedgeshaped Film With Index Of Refraction 145 Transmission Gives 13 B class=