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Plz help me in this light problem

  1. Mar 5, 2005 #1

    plz help me in the following problem?

    "The electric field at point P due to N slits is,

    E (r, theta, t) = A(r) sin (N delta phi/2) cos(kr-wt)
    sin (delta phi/2)

    where delta phi=kdsin (theta) , "d" being the spacing between the adjacent slits. let N=4

    (a) Find two angles on either side of theta=0 at which there is an interference minima.
    (b) Find the spacing between the minima compare to the case of only two slits of separation "d".

    Now i have solve its (a) part but i just cant solve its (b) part.

    Can u plz help me in this plzzzzzzzzzzzzzzzzz.

    Thanks in advance!
  2. jcsd
  3. Mar 14, 2005 #2
    please post this in the homework help part of the forum
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