Light from an extended monochromatic source S falls on an opaque screen E, which has two small holes. Interference of light passing through the holes is observed at point P (figure). The light source S and point P are at the same distance L from the screen. As the distance d between the holes increases, the change in intensity at point P has an oscillating character. Determine the linear size b of the light source if the 1st minimum intensity at point P is observed at d =
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