Problem 5.118

A plane monochromatic light wave falls normally on an opaque screen shaped as a long strip with a round hole in the middle. For the observation point \(P\) the hole corresponds to half the Fresnel zone, with the hole diameter being \(\eta=1.07\) times less than the width of the strip. Using Fig. \(5.19,\) find the intensity of light at the point \(P\) provided that the intensity of the incident light is equal to \(I_{0}\).