Interference of Light at a Double Slit

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Condition for a maximum:
d sin α  =  k λ

d ... spacing between slits
α ... angle
k ... order of the maximum (0, 1, 2, ...)
λ ... wavelength

Condition for a minimum:
d sin α  =  (k − ½) λ

d ... spacing between slits
α ... angle
k ... order of the minimum (1, 2, 3, ...)
λ ... wavelength