Light with wavelength \( \lambda=0.55 \mu \mathrm{m} \) from a distant point source falls normal...

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Light with wavelength \( \lambda=0.55 \mu \mathrm{m} \) 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 \( \Delta x=0.21 \mathrm{~mm} \) is observed in reflected light. Find:
the degree of light monochromatism \( (\Delta \lambda / \lambda) \) if the fringes disappear at a distance \( l \simeq 1.5 \mathrm{~cm} \) from the wedge's edge.
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