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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?

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# Interference pattern problem

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