Question: Light waves, for which the electric field is given by Ey(x, t) = Emax sin [(1.20 x 107 m-1)x - wt], pass through a slit

Light waves, for which the electric field is given by Ey(x, t) = Emax sin [(1.20 x 107 m-1)x - wt], pass through a slit and produce the first dark bands at ±28.6° from the center of the diffraction pattern.
(a) What is the frequency of this light?
(b) How wide is the slit?
(c) At which angles will other dark bands occur?

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