Two identical radiator have a separation of d =
(
λ 4
)
, Where λ is the wavelength of the wave emitted by either source. The initial phase difference between the source is
(
π 4
)
. Then the intensity, on the screen at a distant point situated at an angle, θ = 30° from the radiators is (here, I0 is intensity at that point due to one radiator alone)