Two spherical waves of equal intensity I0, originating at the points (- a, 0, 0) and (a, 0, 0), interfere in the plane z=d. Use
Two spherical waves of equal intensity I0, originating at the points (- a, 0, 0) and (a, 0, 0), interfere in the plane z=d. Use the paraboloidal approximation for the spherical waves to show that the intensity at the plane z=d is 
Where the angle subtended by the centers of the two waves at the observation place is θ ≈ 2a/d. The intensity pattern is periodic with period λ/θ.
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Authors: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
12th edition
134697022, 9780134313795 , 978-0134697024
