To determine the wavelength of He-Ne laser light using single slit diffraction

1. In flatness testing with interferometry, if surfaces are perfectly wrung. Then which option is correct regarding fringe pattern?
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2. Which type of fringe is formed, if a path difference of λ/2 is observed in an interference pattern?
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3. What is the purpose of conducting a single-slit experiment to determine the wavelength of HeNe laser light?
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4.Which parameter primarily affects the width of the central maximum in the diffraction pattern obtained from a single slit?
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5.In a single-slit diffraction pattern, why do minima occur?
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