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Light with wavelength lambda = 0.55 mu m...

Light with wavelength `lambda = 0.55 mu m` from a distant point source falls normally on the surface of a glass wedge. A fringe pattern whose neighbouring maxima on the surface of the wedge are separated by a distance `Delta x = 0.21 mm` is observed in reflected light. Find:
(a) the angle between the wedge faces,
(b) the degree of light monochromatism `(Delta lambda//lambda)` if the fringes disappear at a distance `l ~~ 1.5 cm` from the wedge's edge.

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