Diffraction of Light by a Single Slit

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Condition for a maximum (approximation):
α = 0°   or   b sin α  ≈  (k + ½) λ

b ... width of slit
α ... angle
k ... order of the maximum (1, 2, 3, ...)
λ ... wavelength

Condition for a minimum:
b sin α  =  k λ

b ... width of slit
α ... angle
k ... order of the minimum (1, 2, 3, ...)
λ ... wavelength