a monochromatic flux from a remote source with a wavelength λ is almost normally incident on a thin glass wedge.a screen is placed at a distance `d` from the wedge.a lens with a focal length `f` projects the interference pattern produced in the wedge onto the screen.the distance between the interference bands on the screen `Δl` is known.find the angle `α` of the wedge if the refraction index of the glass is `π`.
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