Anyone can help me on this one. A plane wave of wavelength [tex]\lambda[/tex]= 550 nm is incident normally on an opaque screen with three narrow parallel slits separated by distance a= 2.3 mm. An interference pattern is observed on the other side of the screen at a large distance from it. (a)At what angles are the first principal maxima adjacent to the central maximum? (b)How does intensity, Imax, at the principal maxima compare to that from a single slit, I1? in (a) can I use asin[tex]\theta[/tex]=m[tex]\lambda[/tex] to get the angle?