A plane monochromatic light wave with intensity I0 falls normally on the surfaces of the opaque screens

Question:

A plane monochromatic light wave with intensity I0 falls normally on the surfaces of the opaque screens shown in Fig. 5.20. Find the intensity of light I at a point P

(a) Located behind the corner points of screens 1-3 and behind the edge of half-plane 4;
(b) For which the rounded-off edge of screens 5-8 coincides with the boundary of the first Fresnel zone.
Derive the general formula describing the results obtained for screens 1-4; the same, for screens 5-8.

oP oP