A wedged shaped air film having an angle...

A wedged shaped air film having an angle of 40 second is illuminated by a monochramatic light and the fringes are observed vertically down through a microscope. The fringe separation between two consecutive bright fringes is 0.12 cm. The wavelength of light is

5545 Å

6025 Å

4925 Å

4655 Å

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