The figure below shows two thin glass plates separated by a wire with a square cross...

 

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The figure below shows two thin glass plates separated by a wire with a square cross section of side length w, forming an air wedge between the plates. What is the edge length w of the wire if 53 dark fringes are observed from above when 628-nm light strikes the wedge at normal incidence? m W The figure below shows two thin glass plates separated by a wire with a square cross section of side length w, forming an air wedge between the plates. What is the edge length w of the wire if 53 dark fringes are observed from above when 628-nm light strikes the wedge at normal incidence? m W